How would you handle this?

Recently sold a $300 coin and sent it registered insured USPS. Buyer claims he received the package but no coin was inside. Package showed no sign of tampering. I am positive the coin was in the package when it was mailed. How would you recommend I proceed. Thanks.
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The only way this is legit is if the person opened the package with the postal employee present and watching and the coin was not enclosed.
When we are planning for posterity, we ought to remember that virtue is not hereditary.
Thomas Paine
Doggedly collecting coins of the Central American Republic.
Visit the Society of US Pattern Collectors at USPatterns.com.
All you have is proof that you mailed and insured a package.
To file a postal claim, the buyer has to sign under penalty of perjury (Federal) what he claims is true.
And so you do.
File the claim and let the Post Office sort it out.
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