I can see the tag in his third picture. on the cowl, by the fender. there will be two sets of numbers stamped on it, the two digit is the engine hp and the longer number is the production number. If you sand lightly and read the production number, there are vin decoders that will tell you what it is. my bet is it will start with a number and AK. having that tag is having gold, I bought a 46 and had to scrap it because there was no tag, the guy said "its screwed to the back of my toolbox" so I paid, weeks months later, no tag. snopro you are probably thinking of a gmc tag, with a second tag.
looks like a 41/42, the 41/42 had the passenger door lock on the handle, 45/46 were a separate tumbler under the handle. also, you have the cast turn signal bases on the front headlights, those were 41/42 only, the die casting was replaced with stamped steel for 45/46. I think I see the die cast rear window surround too which would cement it as a 41. its not a war production/army truck, those had an externally hinged windshield, no crank.
there were really only two full years of production, 41 and 46, some 42s squeaked out with leftover spares and late 45s (really early 46s). of what you got the passenger rear fender is worth some duck, then next money wise the other rear fender. the passenger rear is hard to find because with the small rear window the farmers were always backing into stuff. the drivers rear is hard to find because most farmers put on a flatbed.
the 41/42s are rarer because of wartime shortages, most farmers would buy a new truck every couple years but a 4 year war and slow to produce after the war made farmers keep using their old trucks, by the time new models came out the 41/42 were either scrapped for the war metal or were just completely used up.
I have almost every original part you could need to put that together, some parts not in much better shape than yours. prepare for some sticker shock though, I sold a windshield frame (they rot at the bottom channel) for a pretty penny and a repairable windshield crank setup for folding money. want a rolling 1/2 ton shortbed frame? seat? doors? I got ya.
for free though you scored big time. a good pair of rear fenders will fetch $1000, a repairable pair even gets close.