I think the odds on a RC having a matched bolt are literally one in a million.....
I would expect that it was a RC, that someone has tried to force match (bolt number) and faked as much as possible but couldn't quite remove the 'X' crossed rifle mark hence why its looks small etc. It's probably been sold on a few time since then, and current seller is selling it an RC based on the small 'X' and stock number applied, but ignoring all the other attempts at some point to disguise the RC origin as likely when RC's ere looked down on more before prices when bananas.
As said, if an untouched as it left the Soviet Arsenal after refurb rifle is what is required, then this isn't the rifle for the OP.
My RC that I've recently acquired has had the shellac removed from the early walnut stock by the person that bought it over 20 years ago when first imported into the UK, but otherwise its as it was when it came out of the Soviet Arsenal refurb in the early 50's. Even the locking screws were still missing, which I've put back from my box of original spare bits n bobs collected over the years.