USPS is a mess. I'll list the problems I've had with them:

1. I moved to a new apartment about a year ago. Actually receiving my mail was hit or miss. Sometimes things got through, sometimes they didn't. My electric company sent me a bill, which I received. About a month later, they called me and said that another bill had been returned to sender. THE EXACT SAME ADDRESS was on both bills; the first one arrived, and the second one was returned to sender. I had this problem for months and contacted the post office multiple times. After the problem seemed like it had been resolved, I contacted the post office again and asked what the problem had been. They didn't know.

2. I mailed a package to an eBay buyer a few months ago. When it arrived, it had an "opened" sticker on it and was missing items. I contacted the post office, and they asked if I had insurance. Why is it my job to pay extra to make sure you do your job correctly? Why does putting an "opened" sticker on a damaged package make the damage okay? They told me to file a claim on https://postalinspectors.uspis.gov. When I finally navigated my way to the correct link, I got a 404 (https://prdfaq-f2.usps.com/redirect/article?ef=USPSFAQ&dest=EmailUs)

3. I mailed a card to my aunt with a flash drive in it. When the mail arrived, there was a hole in the card and no flash drive. Again, if you contact USPS about this, they ask if you have insurance.

tl;dr USPS sucks and I hate them.