Member hasn't responded to my emails requesting pick up of their item, item sold 1 month ago and is not paid for. What should I do?

[tim6673]

Item sold via Auction on 16/7/12. Buyer contacted me on (19/7) to arrange pick up, I was not able to accommodate p/up on that date becasue I was interstate. (20/7): I responded to the buyer that I was unable to have them collect on that day and that I was interstate. I asked "Is there another time you can come?" (20/7): Buyer responded "No rush, let me know when your back." (20/7): I thanked them for their understanding and said "When I return I'll check my schedule for next weekend and I will get back to you".

Upon my return (24/7) I emailed the buyer; "Would you like to collect Sunday 29/7? Time, Address & my Mobile number was provided in the email. *no response from buyer*

(31/7): Emailed buyer: "Touching base to see when you'd like to collect your item?". *no response from buyer*

(9/8): Emailed buyer: "Just following up to see when you can collect your item?" *no response from buer*

So what is the next option for me?