Ebay help.

Barracuda · 2015-02-08T18:52:41.000Z

So I sold an item on 01/24/15, I shipped it on 01/26/15, and the item was delivered on 01/30/15. The buyer e-mailed today outside of eBay and states that the item was never received. Is this a scam? I was leery about sending the item since the account had zero feedback and the user name was just random numbers and letters but I did anyway since it was paid for. Should I just ignore them? Any advice would be much appreciated.