What can I do if I am being involved with possible stolen credit card scum?

The online shop sells tickets and travel agency redeem the tickets to be paid by the online shop. There's a seller who sells travel tickets cheaper than online price. The seller says he can sell cheaper price because he buy those tickets with gift card and credits. The seller purchased tickets from online shop and sold them to me at a cheaper price. I paid via PayPal and seller never did scum me so far. I tried to use the tickets by calling travel agency where the actual tickets can be used. I didn't use my name or information because I was trying to book for somebody else. I thought I was getting quote first for someone else. I thought my information were irrelevant. Travel agency found that tickets were purchased by stolen credit card and they told me that they would take legal actions. I told the travel agency that I bought vouchers from someone else. They don't believe me because they now know I didn't use my information to book a trip. Now, the travel agency know my name, email and phone number. I called the online shop where the seller bought tickets for me. The online shop doesn't reveal information because I'm not the original purchaser. Luckily, online shop told me that the purchase was not used by gift card or credits. I assume the seller may have used Stolen Credit Card, or at least lied to me. I contacted the seller and told what happened but seller kept saying there's error because the seller uses multiple accounts that were against the policy. That's why the purchase was called fraud. Anyway, I asked money back and he did. I don’t have any damage. The travel agency didn't get damage except times and efforts to make reservation for me. The online shop that found the purchase made by seller was not also damaged because they cancelled purchase and invalidated the ticket. The actual scummer, the seller, may need to be reported.