Actually, most of the surplus military rifles I bought that had all matching numbers turned out to be later models. Earlier models that may have actually seen action in combat usually have been stripped down for parts at some point and then reassembled with whatever working parts they had. Post War rifles tend to be the ones with matching numbers.

I would think if you found a verified war productions K98 with all matching numbers and in fair condition, it would be worth a little more. Good luck.