Has This Ever Happened To You?

For Xmas I got Tekken 6 for the xbox 360 from my family. Well a few days ago I opened it up. it was new and sealed and...

It had no disk inside. It was a sealed game, with no disk.

I've never had this happen before. My mom got it from my store so the store just did an exchange. Working as the electronics dept manager now, this extremely rare case has happened a quite a few times with DVDS and somegames (including with Tekken 6, three separate incidents including mine) within the last month; almost ten cases with sealed items not having a disk.

My theory is that it's because of the new environmental cases. Every report had the same type of case, those new environmental ones. I think because it's more flimsy then the standard cases, the disk aren't being pressed into the case as well as before.

I was wondering, has this ever happened to you. If so, what did you do?