eBay seller CKStamps listed the item below with one of its typically detailed descriptions of "US Stamps Collection Unused NH NG Proof?" Illustrated is something resembling R133AP1, a proof of the authorized but unissued $5,000 documentary stamp. The proof does not match any of the known copies in Kingsley's book. The scan is not of sufficient resolution to see if it is actually engraved. Based on the seller, description ("Proof?"), and the fact that the scan of the back does not resemble an India paper proof, I did not bid. However, the item brought $1,325. Does anyone know what this was? I assume some type of copy or facsimile. Or did I miss a great opportunity?