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PCBrad: I don't know where you can pick that 1982 card up, but you might periodically run searches on eBay for it and the other cards listed above. I would search broadly, (e.g., "1982 Bowman" and "1952 extension"), because these reprints and "extension" cards are sometimes sold as sets, and you might miss it if you search only using his name. You might also Google the set name -- a dealer may have it advertised.
Your uncle may also have a photo in one of the "picture packs" that fans could buy at the stadium. I think these started in the 40s, and continued throughout the 50s and 60s (maybe even later). These photos are pretty common on eBay. If you get hold of the Standard Catalouge of Baseball Cards, there is a section on "picture packs" which (if memory serves correctly) are sorted by team and year. Assuming there is a series for the team and year, maybe he's included with the 1951/1952/1953 Pirates or 1953/1954 Red Sox? (The picture packs are not completley catalougued, so just becase he is not listed in the catalogue does not necessarily mean there isn't a photo out there.) Again, searching for the photos on eBay by team and year might be useful, because these photos are often sold in groups or as complete packs and you would miss your uncle if you were searching only by name.