I don't know much about them, but I would certainly ask the museum staff about them. There is an entire room upstairs called the 'Research Room' dedicated to researching Charles Schultz and all things Peanuts related. I don't know for certain if they can help, but it would be a good starting point to finding out more.
The staff are adequately knowledged and trained and from my experience have found that contacting them directly is the best way to get accurate information.
Not a clue.
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