Speaking from primarily a seller's perspective here:
Back in December (December 10th to be precise), there were two items I had sold to separate buyers (here in the US mind you, not even international) that seemed to be hopelessly lost in the post office system. Now, the items were definitely not as expensive as your $600 console but they were still sizable purchases. I had waited a good few weeks and there was some contact between me and the buyers, and they were patient and respectful but eventually after a month had passed, and with constant post office pestering & mail investigation claims turning up negative, I just simply refunded their money back with no item to show for it anymore. That's just the reality of being a seller sometimes. The kicker: both items eventually DID show up about two weeks later out of the blue. I kindly asked both buyers if they could either RETURN TO SENDER or just pay me alternatively (which they absolutely have no obligation to do BTW). To my surprise, one sent me a check, but the other was zero communication, so yeah. That's just the reality of Ebay sometimes.
It's really not too hard to find purchased items, everything should be in your history, check under hidden orders if you don't see it. I believe you can send a check like my buyer did, or request an invoice (I have no personal experience doing it this way, so take this with a grain of salt).
Alright well this gives me some hope that I'll still get my console. I feel bad for the guy. I don't know if I could send him a check, but if he were to give me his paypal e-mail address I could pay him that way.
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"undertale hangs out with mido" - ZFS Smash Ultimate Switch Code: SW-6933-1523-8505