Thank you card gets shredded in the mail.. 😅

So we finally got all our thank you cards written And I took them to the post office yesterday. Today I checked my mail and one got returned.. or rather half of one. Somehow it must’ve gotten torn in half in one of their machines. Luckily the half they were able to salvage had our return address on it and we were able to also see who it belonged to (the best man!). But now I’m worried about this happening with other cards and not finding out about it (like if the half with our return address gets lost). I don’t want anyone to think we didn’t write them a thank you, and we spent SO MUCH time on them 🙃 anyone else ever have this problem?