Two things: I went back to my original employer and said I had a new job offer for $70k, and I didn't want to negotiate, I just wanted their final, last ditch offer That's an incredibly awesome way to have a huge target painted on your back. A lot of employers get really pissed at this tactic but won't say so to your face. They will gladly give you that new salary for just enough time to get a (cheaper) replacement o…
Also, I find it amusing the tacit assumption that its somehow moral for companies to look up salary histories via credit reports but that interviewees don't have a right to know the salaries the company has given to other employees.
The information asymmetry is part of the reason that this guy lied-- and to be honest, in 25+ years, I've never had a salary negotiation where the company didn't lie to me "oh, we can't afford that!" (when in reality they are just trying to lowball by pretending they don't have the money. It's a lie no worse than his.)