Help finding a Trophy Whitetail Mount

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I'm trying to locate a trophy whitetail mount that my Father in Law shot in 1964. According to Boone and Crockett, it is in the possession of Bass Pro Shops.
I have tried to contact them by phone and email at acquisitions more than once but have not got any replies. Any ideas on who to contact?
His name is Francis Pries and the buck was a 236 scored non typical shot in Winona County Minnesota in 1964.