Two simple eBay mistakes left me with two transaction defects—and neither one is going away. Here’s what happened, what I tried to do about it, and what I learned about protecting your seller account.

I bought a Kobe /25 for $250, listed it months later for a “make me sell it” price of $2,500, and figured nobody would bite. Then a $1,999 offer showed up. Sometimes with rare cards, it only takes one buyer.

What happens when an eBay Standard Envelope never arrives? After a buyer opened an Item Not Received case on a $4.99 card, I learned how eBay’s shipping protection actually works—and why you shouldn’t rush to issue a refund.

USPS said the card was delivered. The buyer said it never arrived. Then, while the case was still open, the same buyer ordered another card from me. Here’s how I handled the claim, what eBay ultimately decided, and what I learned about protecting yourself without assuming the buyer is trying to scam you.

An eBay authentication issue cost me a completed sale — and exposed a hole in my shipping process. Here’s what happened, what I misunderstood about the authentication process, and the simple step I’ll take with every valuable raw card going forward.

How do you price a sports card when there are no direct comps? I recently had to figure that out with a true 1/1—and then decide whether to push for more or take the offer in front of me.