Leon.......Having had a collection stolen and retrieved within 72 hours I have a little experience.
Tell him to IMMEDIATELY put a classified ad in his local paper to read as follows. BUT HAVE SOMEONE ELSE PLACE THE ADD AND FIELD THE CALLS
"BUYING autographs of old sports celebrities, Top dollar paid $10,000 or more. Especially interested in anything signed by Lou Gehrig & Babe Ruth"
Then have him list his contact number and have someone field the calls
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Buying and Selling Vintage autographs for over three decades
jim@stinsonsports.com