thank you!
no currently all faces inside are deleted. and i dont think it would be that good for the game design, to make the searching of a suitcase also realtime 3d. the idea is this:
the game could be first or third person. but when you click a suitcase or cupboard, the screen changes to a 2D/3D mixture pic, where an open suitcase/cupboard/whatever is shown, and where the items inside could change and -> be grabbed! 
you could make some relatively high poly inside stuff and put some physics on it and make it clickable, grabbable and movable. perhaps you can use some knive or hammer to discover hidden drawers 
ok just fiction but that would be rocking!
hehe i know it all just cheap excuses for that i had to use the polys outside the suitcase for getting the shape 
but anyway i will do some optimising the next days, and perhaps we get some insides then 