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T ESet up a search using his name and click on box for "Items and Descriptions." It is an unusual enough name that it shouldn't turn up too much unrelated items. Then save the page and check it once a day. It just takes a few moments, but if it ever comes up, you'll know. I use the same technique for my Grandfather's work (he was a writer for Daturday Evening Post back in 20s and 30s.)
Then keep track of auction houses. You will find it!