Sold an iphone on ebay and the person said they never got it.what can i do?

The delivery was estimated to be july 23. And unfortunately someone threw away my receipt and my tracking info before i could put the number in. I tried calling the post office and they said they can't do anything? Is there any way i can have them look it up?

Just wait, if you sent it it'll get there. I've had stuff arrive before the estimated arrival date and after up to a week early and a week late.

Yeah wait a while that's the estimated arrival time. It doesn't mean it will get there by/on that day. And be careful they might be trying to get their money back even if they all ready got it. But they will check mail records and such before they would charge you for the money that person paid but if you think somethings suspicious close your account.