I live in Sweden. We don't get mail.
Can confirm. Got a slip in the mail yesterday that I had a package to pick up at the local post office (not the local convenience store where they're usually shipped which I thought was weird). I get there this morning and found out that the package had been returned just a few hours before but it was also missing somehow? Went home, called customer support and was told that the package had been returned and that there was nothing they could do about it, they did tell me that the reason I hadn't gotten any information about the package when it arrived in February was because my name was misspelled in their system (likely due to an OCR issue) so that's why the first notification slips they'd sent out never reached me. Just minutes after that phone call ended the receptionist at the post office called and informed me that they actually had my package (it had been placed on a different shelf) and so they sent it out to me as soon as they could (she was very helpful so mad props to her).
So it seems like the only reason I actually got my package in the end was because some hero at the post office decided to actually look at the package before it was about to be returned and realized that my name had been incorrectly entered in their system. after which they sent out a note telling me to pick it up and also set the package off to the side so that it wouldn't be returned along with the other packages that were scheduled to be sent back this morning. I feel like his whole mess could've been avoided if their OCR system had a sanity check to make sure that it doesn't misread names (maybe one that compares the scanned name with the names associated with the receiver's address and/or phone number since that info is public here in Sweden).
And it's not all bad, expensive packages aren't just left on people's front porches here like in the US for example, but the postal service is definitely in need of some improvements.