To echo what Steve said... not all rifles were converted.... so to automatically assume the bolt is from a converted rifle is a mistake. The bolts were standard NM bolts with their original rifle serial number applied by SA and then blued.. While we use the bolt as an identifier for a real rifle.. there are countless other things we know apply to the rifle itself that tell whether it is a legit Unertl sniper .. So IMO it is better to have a rifle missing it’s original bolt.. then the other way around.
The only real value is if you own the actual rifle and it is determined to be a team rifle or sniper.. otherwise it is worth about 2-3 times what a NS bolt is worth.. so about $400.