I don't know who, if anybody, is buying shares privately or otherwise but there are third party companies that specialize in buying suspended or revoked shares. Question is.... why would they do so if the shares are supposedly worthless?
Here's a snippet from Motley Fool....
"Buyout
Not all delistings are necessarily bad -- a company's stock can be delisted in the event of a buyout or merger. If a company is bought out by another public company, stockholders might receive cash for their shares or could get shares of the acquiring company. If the company is taken private, shareholders will generally receive a cash payment for their stock at the time the shares are delisted."
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