Hopefully, the owners of the previous address will be kind enough to either send it back to you or find the recipient that it is supposed to go to. I did that once with sending some gift cards to my granddaughter. I sent them to the town they used to live in and to this day I have not gotten them back nor did my granddaughter ever receive them. Oh well, my error and someone else enjoyed the gift cards. I try and be more careful now.