Hello! So my husband and I made a quick decision to purchase 5 signed guitars from the estate of a collector for $100 each. We figured it was worth the gamble for that price. These were the last 5 available in a collection of about 22 others. They didn’t come with COAs, but other ones in the collection did have them and the guy seemed like a serious collector. Advice on what we should do to try and get them authenticated? We’ve spent the last 3 hours figuring out the sigs because the seller knew nothing about them. We have Tom Petty, The Rolling Stones, Santana, Steve Miller and U2. Ill try and figure out how to attach 5 photos...