I’m top 10 verifying submissions and a top 20 submitter. I usually submit most the serials I see on Pinside and that’s where most the top submitters get there number.

If you’re not one to submit your own machine serial numbers, simply post a picture of it on Pinside and chances are very strong someone on the IPSND will snag it and submit it on your behalf and state that you are the owner

I’ve tried to focus on certain titles specifically that I submit every example and serial I can find. They referenced some of my efforts on captains auction at Banning. “Only a few of these even recorded!” And I looked and 8 of the 10 were by me, lol!

It’s really useful I find, especially for games that we don’t know how many they made.
Modern sterns it’s harder but still only in the thousands. It shocks me how “big” the hobby seems when there are in reality not many actual machines in existence.