you can report the mail.com account for abuse
herehttps://www.mail.com/company/contact/ also report the ebay
accounthttps://spd.ebay.com/RBASellerHub if above doesn't
workhttps://www.twitter.com/AskeBay or
https://www.facebook.com/eBayForBusiness
If this was actually from an aol mail account, can report the account
herehttps://postmaster.yahooinc.com/report-abuse how to read email
headershttps://www.wikihow.com/Read-Email-Headers/
Quick start here
https://live.autographmagazine.com/forum/categories/is-this-autograph-real/listForCategory
To get authenticatedBeckett
https://www.beckett-authentication.com/autographcategory-list (search
for Marlon Brando)