" I have to disagree with the above two responses. According to Audiogon policy, the buyer's money should be refunded before the amp is returned."
It's easy to do the right thing when it's not your money. If it was AG's money at risk, do you think they follow the rules they set for you? You're obviously not trying to take advantage of anyone here, so protect yourself.
As far as the rest of it goes, you need to be careful. First, its not an international sale. You shipped the amp to Miami, not S America. Assuming it was damaged in shipping, which shipping company was responsible for the damage? The one that sent it to Miami, or the one who sent it to S America? No one in their right mind would ship a used amp like that to another country without checking it first, so you have to assume the damage was done after your transaction was completed. And that would be when the amp was delivered to Miami. What happened after that has nothing to do with you.
Also keep in mind that the "shipping agent" (most likely a friend or family member), was too cheap to get the proper insurance when they sent the box to S America, so they're using you to fix a mistake you didn't make.
