Dear Rose. I don't know if you read through the entire thread. The likely culprit is our maintenance man's wife. They both have lived here for decades. Obviously the maintenance man already has a key to the buildings since he cleans each one on a regular bases. There is one key that fits all the buildings' locks. So the issue of security is moot. If they changed the locks, they'd have to issue the new key to Rich (the alleged culprit's accomplice) anyway. It's likely they wanted to give the key to a family member rather than pay $75 to get one since you can't just take it to a hardware store an have it duplicated (it's a DND key..do not duplicate).
Even if an "outsider" had the keys, there are close to 100 units in our complex, many with more than one family member. It would take time and quite an expense to replace everyone's entry way keys. They are not regular keys. According to a search the original makers of those keys charge an arm and leg for replacements. As an added safety feature, each apartment has two locks...one of which is a deadbolt. I appreciate your concern and I do to mention this to the VP of the board.
Too funny! 
