This didn't stop them from calling me and threatening my credit rating, but it seems their threats had no teeth. /anecdata
He factually had at least $500 in the first place. That's how he paid for the item in PayPal to start with. Also, he did received the iPhone according to his own words in the eBay complaint he did. What he claimed was that the iPhone was not working correctly.
In USA, will you put $70K at stake with high risk of catch to win $25K at max?
IMHO, postage was opened at custom (because it declared value was over $150) and phone was stolen by a guy, because their low wage forces that way: they can stole 10x of their yearly salary in just one month, until they caught. When they are caught, they will bribe police and leave. New guy will come and will work for next few months, repeat.
Also, if the phone was stolen at customs then WHY did the buyer claimed he actually received the iPhone? Again the complain was that the iPhone he received was not working correctly NOT that he didn't receive the iPhone.
I have no idea why he claimed that. Maybe it's just Google translation made wrong.