Well, I got in late, so I'm not over the 45 day period. I filed a dispute, with this as the text:
Seller disappeared after collecting money for a group buy of keyboard keycaps that were never paid for. Contacted the supplier and no order for the keys was ever placed. Seller is nonresponsive via email or through the website the group buy was orchestrated on. Several other users are in the same boat, but likely past the 45 day dispute period. Guy is a thief.
Once all of this is all sorted out, I will run a group buy for these keys myself. That really pisses me off, and I'd like to remind everyone that just because it appears we have a thief, does not mean you can't trust other legitimate members of this community.