We also have the famous TMOST photos of the Finney hero, including an interior shot. But, as noted, the details of this auction P1 do not match the TMOST/Finney. The auction piece has no watch crown (like the Jein, but not the TMOST), and has Velcro (like the Jein, but not the TMOST). The TMOST P1 had metal rails on both sides, and even when looking at the fuzzy, low-res photos in the book, the rails appear to have been glued to the outside of the shell (like the Jein), with no slots cut in. As opposed to the auction piece (and numerous fanmade replicas), which has one rail/slot, and Velcro on the other wide.
And the interior details of the auction P1 do not match the TMOST.
So, if would have to be the Lenore or the Nona—or some new, mysterious, unseen 5th hero—and, even then, what “tells” we have on the screencapped heroes do not match.