Jim,
I arrived home late last night from the Pigeon Forge Knife Show in Tennessee. The knife would not be marked as refinished. If the knife is refinished at the Randall shop it does not seem to hurt the value of the knife if it was made after say, 1970. But a used sheath and a mint knife bring less money. Earlier knives, especially 1940 and 1950's knives, it hurts the value greatly as a knife that age, has a certain aged patina, that serious collectors look for. The actual look is hard to explain and something you just have to see. Find a collector that will show you some and try to get to know what to look for.
Or you can carry your favorite laboratory microscope with you and look for the tell-tale signs Mr. Mathews sees. But evidence of those marks do not hurt the value of the knife. If the cleaning was done yesterday, those marks will probably not be there. But if this was the fellows favorite knife, they may be if he was taking it out of the sheath a lot. Just having a little fun with Mr. Mathews for his "none reply " remark. But Friday when I looked I did not see this post here, as it must have still been on the Custom Forum.
Regards,
Rhett Stidham