Holy thread resurrection :-)
I was looking at the feedback on the Newsted Reverb page, a review was given for the 10 string by Rex B.
So I'm currently heavily thinking Rex Brown (from Pantera) got it :-)
Makes sense, since it was sold before the auction opened. Also the feedback given suggest it was someone who personally knows Newsted:
"1992 Alembic Europa Custom 10-String Bass Owned by Jason Newsted
Rex B. – Aug 1st, 2024
Thank you Jason!! I’m incredibly fortunate to have this Bass in my Collection!! The Reverb staff were impeccable, as always, in rushing me this piece of History!! Heartfelt Thanks for always taking care of me…"