That Kriegslok auction just screams "SCAM!", but the Reno looks legit. The fact that the guy has a lot of current feedback on other model railroad items, all of it positive, is definitely a good indication there. I'm not sure what to think about the Shay though. The lack of recent feedback is worrying, but the seller did answer a bidder's question about the engine, so I'd take that as a good sign.
Reno looks legit, he sells mostly model trains in his history
BR96 is a sparkie same seller
Shay - seller has not sold anything since 06 BUT has many buying remarks up to the end of dec 07. - the wicks are not even fired yet I assuse it was not like he states.
BR54 seems spooky - in AU but listed as a US seller. No recent sales only purchases. Only wire transfer! limited photos. Maybe asl him to supply additional photos on a specifir part of the engine? Thats how I justtift its lefit, he cant produce the photo it probally a scam. O and no reserve on it?