In general, the rifles with the more desirable scopes (dated WW2 scopes) and the more desirable maker (Tula) were bought up early. Most of what you see left will be undated, potentially post-war, scopes on 1943 and 1944 Izhevsk rifles.
FWIW, the PU scope was manufactured in the Soviet Union until at least 1960 - and typically most post-war scopes are NOT marked with a date of manufacture. Most WW2 made examples were refurbished after the war and marked accordingly with a box and a slash or X through it, and sometimes the year of refurbishment. Some wartime scopes were not dated, but that was uncommon, and given how many of the Molot guns have undated scopes, it's safety to say a good many of those scopes are post-war. Legit military, but not WW2.
And another point, Tula only made PU variant snipers in 1943 and 1944. So if you find a PU Tula on a 1942 or 1945 receiver, it's a put-together. Period. Izhevsk only made, 275,250 sniper rifles and Tula is thought to have made only a small fraction of that many - they are considered MUCH rarer. Exact numbers of Tula made guns are not known though.
Finally, a LOT of the guns that came in (proportionately) have WW2 era Tokarev scopes on them. These would be legit scopes removed from SVT40 sniper rifles and installed on later (1943 and later) PU sniper rifles. A legit variant, though for some reason, a lot more common in the molot import than dated WW2 PU scopes. I can only assume the latter had a high(er) attrition rate over the years. You will also see a lot of the molot gun got new wood in the 1960's or later. Not many left at dealers with their original WW2 stocks, though some (like mine shown above) had WW2 wood, WW2 dated PU scopes and were Tula. Were I still looking, that is what I would look for in terms of retaining value.