CRAP! That's garbage, man! The delivery driver could have taken it himself as he knew that it was valuable since it had been held up by the customs. That sucks so much, man!
The only small bright side is that the rounds were numbered, so if someone stole them and tries to sell them, you can prove they are your rounds. Still, sucks that you don't have them. I'm really sorry for you!
Im staying positive, they have just been mislaid 🤔😢😕😭😭😭
But I do like that serial number idea, that's handy to keep an eye out for.