I just read someone here posted this earlier. Remove if needed. This auction shows two Alembic-John-basses for sale, yet we've seen these basses sold and owned by others before this auction. The ad alludes to Fleetwood Mac being involved. Looks like previously sold Mac stuff being offered from non-Mac current owners, and some from the band.
https://juliensauctions.com/about-auction?id=428
