Depends if it was the item sold on the 14th, have patience's.

If it's over 90 days, it comes under your states unclaimed items laws.  but keep in mind any paypal or credit card chargeback issues.

Most likely anything before the 90 days anyhow, not much you can do if you have sent reminders.   

In my situation I have sent 2 reminders,  than forget it,  let them contact me.