Not Cool

I found this notice on my door on Friday night:

"Dear Residents:

Last night, the apartment complex experienced a break in and one of the items stolen was a set of master keys. We have already started the process of rekeying all the apartment units. The rekeying process requires that we enter each apartment unit. Each entry door lock will be reconfigured so that the stolen master key will no longer open the lock, but your individual entry lock key will still be operative. We hope the process completed by..."

A locksmith stopped by early on Sunday to change out the tumblers, the whole process took all of five minutes and indeed our existing keys still work - but it's still unsettling.

What would keep some random con man from posting such notices, and changing out a whole series of apartment's locks, only to allow himself access any time he likes? I didn't call the office to verify this notice, and I doubt most residents did.