Snap it up and sell it for a profit. $250 is waaay cheap, but that seller is either under pressure to get rid of it or has no idea of its value. I've surfed across other Craigslist ads where just a standard K5 topper has a price of $250 to 'em....not pleased with this showing up..... Funny how things work out sometimes...
Meanwhile, the 'eBay bidding culture' is seemingly sending shell-only Chalet #0290 clean paste a grand, where the last highest price I ever saw for an orphaned shell-only was $610.