Do I have to pay UPS to return package to sender?

Question

A month ago I bought a guitar on ebay and somehow it got lost when he sent it via UPS. He filed a claim and UPS authorized a lost parcel claim. So he sent me a replacement. After he had sent the replacement, UPS arrives at my door and delivers the lost package. Without thinking I opened it. Now the seller wants me to send the lost package back because the replacement one is mine. Will I have to pay UPS to return the lost one back to the seller?

Answer 1

In short yes as you opened the package. Had you not opened it up you could have refused delivery, and UPS would have returned it to the shipper, I know that that isn't the  answer that you are looking for but that is the answer