

Most apartment locks and such are made for the purchaser to be able to easily and quickly re-key. You set it to be rekeyed, put a cut key in, and then lock the key pattern for it in place. Takes like 5 minutes or less. That way every time someone moves out you can keep things secure without replacing the lock.
In your case, the building manager was just a lazy fuck.
It is common for lock makers of normal locks to do production runs of just like 50 different key sets.



















Went there and watched them fly out at dusk on a vacation as a kid back in the early 90’s. It was really cool seeing such a massive amount of bats all at once.