I dispatched an item in a great hurry (just before I went on holiday), and forgot I had paid for it to be tracked. When the seller contacted me and said it hadn't arrived, I refunded them (as I thought I had no choice), and only then discovered the receipt with the tracking number. According to the tracking on Royal Mail, they have the package and tried to deliver it twice but got "address inaccessible".
I'm trying to contact the buyer to tell them they'll need to go pick up their package (and then pay me), but the buyer hasn't responded for four days now. Is there anything else I could try? The package didn't have a return address on it. Thanks!