I sent a letter across the country (the West Coast to the East Coast) about 4 days for an exchange of eBay. It was a white envelope with my address and in his two stamps. It states that did not received, but I reckon he's lying. Is there some way for me to continue this? (I have no tracking number, since it just a regular figure) thankss

If you have already submitted without monitoring arrangements, can not follow retroactively. If you can send another letter to say or do what the first is supposed to, then go to the mail and delivery confirmation. The postal service can follow. Of course, the recipient could still deny that the content is as you describe.

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