I am very sorry about this situation Rebecca. I know that it was a hard experience for you but I would like to clarify some things here; I do not own any cameras(secret or public) in or outside my building. There is a hotel next to my building, they have cameras and I promised you that if I can get a hold on to their records, I will share it with you.
You said that your door was unlocked and untouched when you were back in the apartment midnight, you also said that you locked your door when you were leaving. I can’t see how a lock can be opened without scratching the door. I still think that you forgot to lock your door and left it open.
This was a very unfortunate event and I can not imagine how it was for you. I hope we won’t have to go through this kind of situation ever again.