One more try on this... I found the following item sold at Lelands that provides the most extensive explanation of the type of stuff he had, but it's still fairly limited:
https://lelands.com/bids/the-1939-ce...of-harry-evans
There's a handful of other auctions but nothing that expands beyond the specific item for sale. I'm still hoping that there's someone with information out there about the kinds of things he had in his collection, if his name holds any "value" in the hobby (in other words, does "Harry Evans Collection" carry any kind of premium compared to similar items that might be from an unknown source), etc. Thanks.