Detailed history of past owners is here -
The unique 1856 1c British Guiana Black on Magenta stamp photo
The latest issue of Linn's has announced that John E. duPont, had died - famous for being:
i) A member of the duPont family,
ii) A convicted murderer serving a 13-30 year sentence for murdering an Olympic wrestler, and
iii) For us, the owner of the unique 1 cent British Guiana magenta
As far as is known, the stamp is still sitting in the bank vault in which it was held at the time of duPont's arrest in 1996. What will happen to it? Who knows...
IIRC there were some legal battles over it, ie. the government wanted to seize it and sell it to pay a civil lawsuit, in the OJ style of "he's not guilty of murder, but he does have to cough up $33 million".
Maybe Feldman will make some phone calls and try to secure it for another secret auction.
Unique 1856 British Guiana Black on Magenta stamp 1935 Royal RPSL Certificate f Genuineness.