Are custom forms need with Depop labels?

So when I go to the post office usually they scan each label for me. But today the guy was rude and abrupt. Took the packages and dumped the down the hole before I could understand what he was doing.

Two of the packages had labels for CANADA and I am in the US. Are they going to be ok with customs forms? I’m so upset and terrified. 😭

These are just the labels Depop makes.