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D. BerginI'd guess the seller was confused a bit. Ali's U.S. based training camp was in Deer Lake, New York. I'd never heard of him training in Long Island. He fought Trevor Berbick in Nassau in the Bahamas. Ali would often set up camp weeks ahead of time in the location he was to be fighting. This is probably where the autographs of Ali and his entourage were obtained.
I'd venture value is somewhere in the $500-700 range.