Customer bought my item

I verified the address it was mailed to through ebay and paypal, both correct as to what is on the package. Ive contacted the seller but I have yet to hear anything, i know its only been a few days. My question is if I dont hear from them what do I do?

Here is the tracking information.

May 1, 2014 , 1:15 pm	Delivered	ACCOKEEK, MD 20607
Your item was delivered at 1:15 pm on May 1, 2014 in ACCOKEEK, MD 20607.
May 1, 2014 , 1:34 am	Processed through USPS Sort Facility	CAPITOL HEIGHTS, MD 20790
April 14, 2014 , 12:28 pm	Unclaimed	HOUSTON, TX 77051
March 25, 2014 , 9:23 am	Notice Left (No Authorized Recipient Available)	HOUSTON, TX 77033
March 24, 2014 , 9:09 am	Notice Left (No Authorized Recipient Available)	HOUSTON, TX 77033
March 24, 2014 , 8:17 am	Out for Delivery	HOUSTON, TX 77051
March 24, 2014 , 8:07 am	Sorting Complete	HOUSTON, TX 77051
March 24, 2014 , 5:43 am	Arrival at Unit	HOUSTON, TX 77051
March 24, 2014 , 1:54 am	Processed through USPS Sort Facility	HOUSTON, TX 77201
March 22, 2014 , 2:01 am	Depart USPS Sort Facility	CAPITOL HEIGHTS, MD 20790
March 22, 2014 , 12:18 am	Processed at USPS Origin Sort Facility	CAPITOL HEIGHTS, MD 20790
March 21, 2014 , 5:00 pm	Depart Post Office	ACCOKEEK, MD 20607
March 21, 2014 , 1:20 pm	Acceptance	ACCOKEEK, MD 20607

Your buyer had three weeks to go to the post office to pick it up and didn't, so USPS sent it back.

 

Maybe the recipient had buyer's remorse and decided it was easier to forget about it and have USPS return it, than to sign for it and maybe have to pay return shipping (not every buyer knows they can write Refused on the package, or wants to).

 

It doesn't seem likely they would buy something and then go on an extended vacation.