Ok - so now we've seen a carded sample of Darth Vader's Medical Droid (#37) which is up on eBay. However, if you take a look at the posted checklist. Figure #37 should have been a CloneTrooper.
Check it out here: GalacticHunter Basic Figure Checklist
So what gives? My only conclusion can be that the checklist graphic is from an early draft that has since been revised and should no longer be considered THE list of figures since we already know that:
#37 = Vader's Medical Droid (NOT Clone Trooper)
#38 = AT-TE Gunner (NOT Nemoidian Warrior)
#39 = Pollis Massan (NOT Wookie Warrior)
#40 = Mas Amedda (NOT Destroyer Droid)