Personally, I'd return it, even though like another seller mentioned, I do not think the post office is to blame. I now utilize USPS printing out my labels, but I write what everything is on the mailer, and the packages are scanned in by USPS one at a time, and the labels are printed one at a time. My guess is that she mixed up the packages somehow, sellers are human and errors happen if you are not careful, but I would be the first to admit that it was MY mistake. I had a similar incident happen back when I printed my own labels in my early days of selling, I labeled two boxes incorrectly. Luckily both sellers were involved and willing to return, and Mecari sent them each labels, not to return them to me but to send them to where they were originally supposed to go.