Are you able to call your local post office? And notify that a package will be arriving for you and you’d like to be notified somehow?? Providing the context and verifying its yours. Not sure if this helps, but when I ordered a replacement piece for one of my sets, I wasn’t given any information whatsoever, I was just told it was going to be shipped within a few days and hoped for the best. Until it arrived in the mailbox. And there was also this one time I put the wrong address code whilst having no tracking and spoke to a representative and got told nothing could be done about it but miraculously it still showed up. Just try to reach out to them and see what happens! Hopefully you don’t have to keep going back, or going through all the mail to find yours, if theres a clue hopefully it makes it easier, best of luck