Well i can't imagine a scenario when that would be possible. Might be because I don't trade or know what happens if someone places an order insanely lower than the market price.

All things being equal and I'm first to have the chance. Here is how I'd go about it. I'd buy them, and would feel good about it. Not because I got a deal, but because my first reaction is going to be to contact the exchange support stating I think there was an error, and ask them to contact the seller. This is why I would buy them because I know how I would proceed, and don't have enough faith in the rest of humanity to do the same.

If nothing comes of it and support either doesn't hear back or at all from the seller then great for me, if not then they get their coins and I take my $1000 back. I try to operate in the digital arena the same as I would irl, and this reminds me of someone clearing out their kids stuff and having some random valuable that they have no idea it's actual worth. Some businesses will work out a fair market price, others will low ball it and then reap the rewards.

Again not knowing the intricacies of placing orders for trades, and how I would get an order filled that far below market while others would be passed over; it's hard to comment on. I feel it would be a similar situation for me though. I would check in to see if there was an error and sort it out in a manner that seems fair.

I get why some may think it's okay to do things another way and grab a 100K score off someones error, but that's not me. I'd love to have a score like that but not by directly taking it out of the pockets of someone else.