I agree that it wasn't much profit, - Probably had to move it and just wanted to get out even. Done that before myself...
Loewe doesn't know the rifle, not vouching for it at all, though between the two auctions it looks like the metal is right and the stock fits the variation (pictures aren't good enough to evaluate the rifle). The brg buttplate is almost universal in this range, the RS blank, the crossbolt. How it is serialed internally will make the case. It should be fully serialed inside, with suffix, though many seem to have been serialed by some dude with dyslexia, as often the "q" blocks are suffixed internally with "p" block.
As for when these were assembled, you need to examine the characteristics of the known rifles, - I am pretty sure these are a continuation of bcd/42 serialing, but most were probably actually assembled in 1943. If you examine enough of them it is pretty obvious why, but i will write up something on the MRJ blog this week, as it will fit with the last post I did on MB "dual codes". These are actually pretty interesting rifles and it will be interesting to see how Mike and Bruce handle the subject in V2.