Many cities have professional resellers. They take audio gear from trade-ins from audio stores and evaluate and resell. They know how to pack and ship. Or look for local sellers.
You may change your mind on shipping anywhere. I found buyers for a set of speakers only weighing 60 lbs and all told it would have been $500 or was it a $1,000… you need crates built… then what if there is no damage visible… but they don’t sound right? I finally gave up.
Admittedly, I don’t like dealing with this kind on nonsense.