Solution: With handmades, polishing typically opens up the "ends/pontils". A titanium pen to scribe a P in that area would identify it as polished.
And as far as Stephs comment re: "Most of the positive feedback about polishing that I've been aware of in the past has been because there was one much-loved man who was doing polishing and people wouldn't want to hurt his feelings...." I don't quite agree with that.
Leroy did a fantastic job and I can't imagine it was an easy one. I know he took pride in his work for good reason. I'm not a huge fan of polished marbles but if you had an example that was beat up and wanted to let the beauty shine through (and say you'd been collecting for ~40 years and never seen another one like it), he would be the guy you could trust to get it right. At least in my experience anyway.