Hello friends I will show how create a 3dsmax 3d first aid box model tutorial.
I have used following techniques shown below in this 3ds max tutorial.
[1]-Start 3dsmax and choose "Chamfer Box" with the following size as shown below
Create chamfer box like this in the top view port place like this in the perspective view port 
[2]-Convert into the chamfer box into the editable poly now select the edges then apply the extrude edges with the amount of -2.24 
[3]-Again create chamfer box and place like this 
[4]-Create another chamfer box and apply the control points now drag like me 
[5]-Create two rectangle with the following size and apply the extrude modifier with the amount of 0.2 
[6]-Place the both rectangle like me in the top view port 
[7]-This is my material palette and creates some thing materials like that 
[8]-Set the skylight like this with the following parameter 
[9]-This is my final result are you looking it 