Is it true that this location is open until 11pm?

I'm here at 8pm on a Saturday, and while the doors are unlocked to enter, there is NO ONE HERE, and no way to buy postage. There are boxes and envelopes for priority mail, and a slot to drop mail off to be picked up the next open business day. Only come here late if you already have your postage paid.

The Airport Post office is open EVERY night until 11:00pm. The exception is Sunday when they close at 6:00pm and Federal Holidays when they are not open.