The actual offices in this building don't lock (except for the HR people). After hours access to our floors and to restricted rooms is handled with RFID cards that read just fine through my wallet.
I hate having lots of keys...I'm considering getting some rekeyable padlocks (that take house key cylinders) just so that I don't have to carry the keys to my bike lock. Trying to figure out if I can ditch the building key too since the doorman is always there (but I occasionally use the freight entrance so this might be pushing it).
Don't think there is any way around the mailbox key. Maybe I can break the lock so I can open it without the key? I'm not exactly worried about someone looking in my mailbox (the past 5 years, I didn't have a lock and lived in a much sketchier building).