I took a bit of a break from the Kaiser's Helisium quests and Piston apparently wandered off.
He's marked as being in Helisium Reclamation HQ and isn't there.
He's marked as being in Downtown Black Market and isn't there either.
I have a couple quests from him to turn in - Ultra Secure, and Supply Central. But I can't find the guy.
What other map is he in?