I got briefly bamboozled into reading the Reddit post on this. Apparently we kinda know what Magic community it was found in but not who:

""Update: Polygon spoke Friday with Jeff Tyson, co-owner of Maximum Cards and Collectibles in Whitby, Ontario.

Tyson said that The One Ring was found by the cousin of a regular customer who learned of the epic pull while in the store.

That individual placed the card in a bank vault, secured legal representation, and then arranged for the card to be graded by PSA.

It's not known at this time where the card was purchased or what the owner plans to do with it.""