Wow, he's got a lot of stuff still!! Looks like things he got from old endorsement deals (the Music Man heads and cabinets, the Rivera era Fender amps, and the Gibson "Cream" ES-335's) as well as just interesting stuff.
I wonder about the Gruhn designed acoustic that was in the Guild ads back when Gruhn was involved- very cool guitars that didn't last long on the market. And I'd love to have a Music man HD-130 and a 212RH cabinet again, but those prices are of course way too high for what the gear is.