This is just a guess, but I see you have very low feedback. Which to some buyers indicate a new / inexperienced seller. Which means, "I'll try a scam and see if it works." The problem is that it's usually a losing battle with eBay since they're going to side with the buyer 99% of the time.
If the buyer files a case with eBay you're going to have to upload tracking information to eBay. (I know they already have it in their system, but you'll have to upload screenshots anyway). You could also mention that you talked to the post office on x date at xyz post office and spoke to abcd employee. Then eBay will make it's decision on whether to refund your buyer. Don't expect a positive result. The problem with this is that even if eBay sides with the buyer and makes you pay them back, the buyer can still leave negative feedback, which you don't want.
Or you could do this.
Decide the value of the item you sold. If it's not worth fighting about consider it as the cost of doing business (In other words you know they stole from you, but it's not worth the hassle), refund the buyer if they open a case, and then block that buyer on your blocked buyer list. Infuriating, yes. It may be the best way to go if you plan on being a seller on this platform
How do your prevent people from taking "shots" due to your low feedback rating? Two ways.
1) Buy things on eBay that you would use in real life. (Soap, pencils, etc.) Leave + feedback. Many sellers have an auto-feedback feature. If a buyer leaves feedback then it's automatically reciprocated. Some sellers have auto-feedback for purchases. If you buy from them they automatically leave + feedback.
2) Consider selling low value items at 0 or even slightly - profit. Leave feedback on anyone who purchases from you. They may reciprocate and help build up your feedback numbers.
3) One Caveat - Don't nag people to leave you feedback. It irritates them and may result in them giving you a negative feedback rating for pestering them.
Good luck
Boldrocket
