eBay USPS Shipping Question

[gregr2]

I recently sold a card on eBay for $25. The seller paid, I printed the shipping label using the eBay system with tracking. I packed the card up, put the label on it, put it in my mailbox, lifted the flag. Came home from work and the flag was down, our mail is in the box. I go to check on the status of the shipping and it states "The seller has provided a tracking number. The tracking status will be updated once the shipment reaches the carrier."

Now 4 days later when I look at the tracking it still says the same thing. I contacted the buyer and told him that I mailed the card and I wasn't sure why the USPS site did not show any tracking. I also told him that if it didn't show up I'd issue a refund.

Is there anything else I should do?

Thanks
Greg