Just what I see, it gets done alot more than people think. Yes, I would say both have been retouched here in the states. Why....Albania was a dirt poor nation, they pissed off Russia, later they pissed off China, so there was no real $$$$ backing, they was broke..... they were a function over looks, why blow money making nice pretty refurbs, when they were going to just get torn up in the field with use and that money could be spent keeping the gun operational. Usually if and when they did refurb one, it possibly got a no number new stock and non native made parts, no number replacement stocks are fairly common, they were imported way back when Albanian rifles first entered the US. Lots of SKS rifles were floating around the area during this time, like I said, I have an Albanian with a Yugoslavian numbered bolt and another one with a Russian top cover.
As RM showed above typically the numbers were not dark and stain filled, Albania didn't stain stocks, they were coated in an orangish shellac based finish and serials stamped in light colored finish and wood later after assembly. Another prime example is Romania, the same deal, another little dirt poor commie nation, Romanian stocks are typically beat to hell, have little if any finish left and covered in nicks and bumps. When I see a pretty, shiny, fluff and buffed Romanian SKS, I really question it, sure....they do exist, but are very few and far between.
In our culture....guns have to be pretty and aesthetically pleasing, numbers have to match, no one wants a ugly betty beater rifle, sure, pretty matching rifles sell unless they have bringback papers, bring backs usually dont get touched. And very few people will go out of their way to buy an ugly, beat to death, maybe mismatched rifle. So....refinishing happens, love it or hate it, it happens, just like humping of M1 Garands and carbines happens, (Humping: the art of taking a arsenal mismatched rifle and making it totally maker matching to increase value) it can vary from just a scrub down of dirt, to just touching up finish, to a full sand, steam out the bumps and nicks and apply some goofy Home Depot/Lowes finish. but in the end, it will be "sharp" looking and typically at some point flipped for increased profit.
This would be deemed an ugly betty... still has a little finish and rough as a cob, and it's a replacement no number stock
Close up of the butt stock
Another...this is a Romanian example.. little if any finish remains