Open a new document, select the Rectangle tool (M) and create a 251px by 160px rectangle.
With the rectangle still selected, go to Effect > 3D > Extrude & Bevel and enter following settings: Specify rotation around the X axis: 20, Specify rotation around the Y axis: 42, Specify rotation around the Z axis: -43, Perspective: 82, Extrude Depth: 80pt.
With the shape still selected, go to Object > Expand Appearance.
Now we need to fill the shapes with gradient, to do this pick the Direct Selection tool (A), select one of the side shapes, open the Gradient panel (Command + F9), select Linear. In the first Gradient Slider from left to the right apply the color: R:83 G:69 B:69 and in the second Gradient Slider apply the color: R:138 G:126 B:130.
Select the other side of the shape and fill it with the same gradient from the previous step, also pick the top shape by using the Direct Selection tool (A) and fill it with Linear Gradient using colors: R=192 G=177 B=134 to R=213 G=205 B=172. With the top shape selected, send it behind all the other shapes by going to Object > Arrange > Send to Back.
Now copy the shape you sent to the back using Command + C followed by Command + F and position the copy at the top by going to Object > Arrange > Bring to Front and fill with color: R=50 G=31 B=31, then go to Object > Path > Offset Path and in the new window set Offset: -15px, click OK. Select the bigger shape and the shape that was created after applying Offset, open the Pathfinder Panel and press the Minus Front button.
Copy the shape created in the previous step selected with Command + C followed by Command + F, using the Direct Selection tool (A) select and delete the four outer points of the shape by clicking on the point and pressing Delete, repeat the same action for the remaining points then turn off the Fill color and apply Stroke Color R=213 G=205 B=172 and Weight: 3 px.
With the previous shape selected, open the Appearance Panel and click on the arrow in the top right corner and from the menu, select Add New Stroke and change the color to black. Set the stroke to be on the inside from the stroke dialogue.
With the shape still selected, go to the appearance panel and add a new Stroke, change the color to white and Weight: 4px and move the layer under the two you applied earlier.
Copy the last created shape using Command + C followed by Command + B, open the Appearance panel, delete the top two layers with Stroke color, then change the weight to 20px Inside.
With the shape still selected, outline the stroke, Object > Path > Outline Stroke.
Select the Pen tool (P) and draw two lines over the shape from the previous step, then select the two lines and the shape, open the Pathfinder Panel and click on the Divide button.
Delete the bottom two shapes created after applying Divide and correct the bottom corner points of the top two shapes as shown in the picture below. Fill with Linear Gradient, to do this go to Gradient Panel, in the first Gradient Slider apply the color: R=213 G=205 B=172 and in the second one R=192 G=177 B=134.
Pick the Rounded Rectangle tool (R) and create a rectangle with the size W:59px H:12px, Corner Radius: 10px and color R=236 G=229 B=204, with the new created rectangle selected, go to Effect > 3D > Extrude & Bevel, enter the settings in the new window as shown in the picture below. Click OK and position the newly created shape under the shapes from Step 9.
With the shape from the previous step selected, apply an Inner Glow with the settings: Mode: Normal, Opacity: 75 Blur: 5px and color #C0B186, apply a Drop Shadow with settings as shown in the picture below.
Copy the shape a few times and position them as shown in the picture below.
Pick the Rectangle tool (M) and create a rectangle with the size 188-23px. With the rectangle selected, go to Effect > 3D > Extrude & Bevel and enter the settings as shown in the picture below. Move the shape under the shape from Step 9 and over the shapes from Step 14.
Create another rectangle with the size 60px by 23px and go to Effect > 3D > Extrude & Bevel and enter the settings as shown in the picture below, move the rectangle into position as shown below. Copy the shape using Command + C followed by Command + F and move the copy to the other side as shown in the picture below.
Now it’s time to create the lid of the box, to do this pick the Rectangle tool (M) and create a rectangle with the size W: 239px H: 182px and go to Effect > 3D > Extrude & Bevel. In the new window enter the following settings: Specify rotation around the X axis: -45, Specify rotation around the Y axis: 41, Specify rotation around the Z axis: -32, Perspective: 100, Extrude Depth: 20pt. Click OK then go to Object > Expand Appearance.
Now select the two side shapes using the Direct Selection tool (A) and fill with the same gradient from Step 4, to do this select the two side shapes, pick the Eyedropper tool (I) and click on the shape from Step 4 as shown in the picture below.
Now select the inner shape using the Direct Selection tool (A) and go to Object > Path > Offset Path, enter Offset: -10px, click OK. Now select the two shapes, open the Pathfinder Panel and click on the Minus Front button.
As shown in the picture below, take the Pen tool (P) and create a shape under all the other shapes of the lid, turn off the Fill color and apply a 10px Stroke with the color R=192 G=177 B=134.
Copy the shape from the previous step using Command + C followed by Command + B, move it a few pixels to the upper right, change the Stroke color: R=236 G=229 B=204 and go to Effect > Stylize > Inner Glow. Enter the following settings: Mode: Normal, Opacity: 100%, Blur: 3px and Color: #FFE3A4
Copy the shape from the previous step using Command + C followed by Command + B, move it a few pixels to the top right, change the Stroke Color: R=192 G=177 B=134 then open the Appearance panel and click on the Inner Glow layer and change the color to #6B6B6B.
Now copy the shape from Step 21 using Command + C followed by Command + F and delete the four outer corner points, turn off the Fill Color and apply a 1px Stroke with the color: R=236 G=229 B=204.
Pick the Ellipse tool (L), create a circle with the dimensions W: 5px H: 5px and go to Effect > 3D > Extrude & Bevel, enter the settings as shown in the picture below, click OK and send the shape behind all remaining shapes by going to Object > Arrange > Send to Back. Move the shape into position as shown below.
Select all the shapes of the box, except the lid and copy them using Command + C followed by Command + F. Move the shapes from the copy to the other side of the box and position the box as shown in the picture below. Create a shape using the Pen tool (P), select the box and the shape you just created and go to Object > Clipping Mask > Make (Command + 7).
Select the Rectangle tool (R), create a square with size W: 37px H: 37px, then go to Effect > 3D > Extrude & Bevel and enter the settings as shown in the picture below. Click OK and send the shape behind all others by going to Object > Arrange > Send to Back, move the shape into position as shown below, then copy the leg of the box twice and move them to the two corners of the box. Now we are finished.
Here is the final result. To take this image further you could try adding some rings and necklaces, or for the more advanced user, you could try adding in a ballerina and key to make this into a music box.