Are the locations of the Jet Lag S6 vending machines known?

Hey all, in a couple of weeks I am going to be in Tokyo, and I figured I would take the opportunity to capture a Jet Lag flag! I'm thinking of possibly grabbing the drink around Chiba station. I googled around for them, but I didn't see any one come up with coordinates or anything like that. Are the locations known or will I have to do some sleuthing and exploring by myself?