Happens to me rather frequently. I’ve two “homes.” When I get my mail forwarded, they are usually a week late. I can understand that, but I don’t understand sending some mail back to the sender saying I’ve left town leaving no forwarding address. They seem to particularly enjoy doing that with credit card bills. I called them once about the problem ( yes, I actually found the number. It took a search warrant, but I got it!) and the employee assured me the postmistress would return my call on Saturday morning. That was two years ago. Still waiting….