USPS excluded from COVID guidelines?

So recently my local United States Postal Service Office has decided that they are no longer delivering packages to apartment complexes. It’s a huge annoyance, and I was told I have 3 days from the date of notice to claim my package before they send it back. One was already sent back even though I rescheduled delivery before I was told I have no choice but to pick it up. The notice they leave actually tells me to reschedule delivery or go pick it up the next day.

Anyways, I went to go pick up my package at my local post office, and was taken back by the total disregard of COVID-19 guidelines. Everyone was crammed inside this tiny building, no one was six feet apart they were barely a foot away, people were crammed together by the doorway, people were wearing masks like chin diapers, the place looked a mess and it was clear no one is sanitizing anything. When I spoke to one of the representatives working there, I was told they didn’t have to follow the guidelines.

I don’t believe this is true, we are currently in stage 5 and this new rule they’ve implemented is only going to get people more sick if they’re going to be huddled together in a small building for an hour or longer for their mail.

I just want to know, is the USPS excluded from following any local COVID-19 guidelines. If they aren’t I would like to report them but don’t know the proper channels to do so. Any help would be greatly appreciated.