Mr. X ... was it ever determined who he/she/them were?

[Howe’s Hunter]

I was just going through an archive post, and one of the threads mentioned the Mr. X collection of PSA graded cards that was up for sale. I remember at the time some speculated that it was Charlie Sheen's collection, being sold to pay off wife number two, or three, or whatever one he was trying to rid himself of at the time. But did we ever find out who Mr. X was?