Hi…..friends here i will show how create a stock vector illustration 3d first aid box images.
In this tutorial you will learn how to create a first aid box quick and easy.
[1]-Choose the Chamfer box and create Chamfer box with the following size
Now place like me 
[2]-Convert the chamfer box into the editable poly
Now select the polygons and apply extrude polygons with the amount of -2.24 
[3]-Create Chamferbox with the following size and place like me
[4]-Apply the FFD 3×3x3 modifier and select the control point
Drag the control point like me 
[5]-Create two rectangle with the following size and apply the extrude modifier with the amount of 0.2 
[6]-Place the two rectangle like me 
[7]-Create two more rectangle with the following size
Go to the boolean now boolean the object like me
[8]-Your object should like this 
[9]-Apply the extrude modifier with the amount of 4.0
Now place like me 
[10]-Make the materials like me 
[11]-Set the skylight like this with the good following parameters 
[12]-Now you are done it enjoy the final output as shown below 