Glad to see that someone's noticing Aaron! Easily one of the best players in the Boston area and a really friendly guy to boot!
I saw the entire photo album of the Volvo event in the 2nd photo you posted and that 5-string is a Ristola, I'm 100% sure of that. here's a better photo of the bass:
http://www.greaterbostonphotography....on_4258106.jpg
And a link to Ristola's site:
Ristola Instruments - Electric Basses, Custom, Exotic, Professional
I first found out about Ristola thru a friend of mine who bought one off Nate Edgar(bassist for John Brown's Body) a few years ago.
If I bump into him again (and hopefully I will!) I'll ask him what the other bass is. He's got a MySpace, so if you're really interested about the 1st one you may want to try asking him there.