Hah!
From an 1872 article at
https://books.google.com/books?id=85dQAAAAYAAJ&pg=PA8
" Colonel Alston then gave the history of one of Mr. Herbst's autographs himself. During the war, on one occasion, he {Colonel Alston) was in want of two thousand dollars, which he borrowed from the famous partisan leader,General John H. Morgan, giving his note for the amount. The money was repaid and a receipt taken, but the note, being elsewhere, was not destroyed. After the war, Mr. Herbst being anxious to obtain the signature of General Morgan, ColonelAlston gave him the receipt for the two thousand dollars. The wife of General Morgan, in looking over the papers of her murdered husband, found Colonel Alston's note. She, of course, wrote to ask its payment by Colonel Alston. This gentleman was in consternation, as he supposed that he had lost the receipt. At last he recollected that he had given it to Mr. Herbst. On inquiry he found that it had been kept by that gentleman among his most cherished relics. Thus a pursuit ordinarily considered merely curious saved the double payment of a considerable sum of money by an innocent party."