I haven't but a ton of people on here have. I assume you're in the sent the invitations and wondering why you haven't gotten anything back yet phase? It took almost a full week for us to get any back. But if you're super worried, shake down one of your bridesmaids to send hers back.
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As long as your address is on the postcard and it's stamped, your guests are just being silly. We've had a few people send cards and throw the postcard in but that was usually a regret with some cash.
Nope no issues. I’ve gotten the majority of mine back and most traveled across the country. My sister had postcard response cards from minted and had some issues, but I’ve had no problem with the ones from Ann’s