Could it be that this is just the local ThinPrint printer driver adding the printer from your local machine?
Otherwise just try to find out which Appstack has the printer installed (it should be only one), attach it to a non persistent to a machine without Appvolumes Agent and try to look in the snapvol.dat file to see if you can find a reference to this printer. It could well be that it is installed (or repaired or something like that) during packaging of the appstack.