New Ebay and online sellers in general get scams run on them, and buyers get free things. Here are a couple common ones.
No USPS Tracking: claim that the item was never delivered.
The buyer notices that there’s no USPS Tracking (delivery confirmation) tag on the item, and then claims the item was never delivered.
Ebay will side with the buyer and issue a complete refund with shipping.
So, use Delivery Confirmation. It comes with First Class Package postage.
Buyer Asks for Refund Outside of Ebay
The buyer wants the item for free, and suggests a refund performed outside of Ebay.
Don’t fall for it. Communicate with the buyer only through Ebay.