Thanks to Siggie at LCF for this valuable information:
"U.S. Postal Inspectors investigate any crime in which the U.S. Mail is used to further a scheme--whether it originated in the mail, by telephone, or on the Internet. The use of the U.S. Mail is what makes it mail fraud.
If evidence of a postal violation exists, Postal Inspectors may seek prosecutive or administrative action against the violator. However, if money is lost through a fraudulent scheme conducted via the mail, Inspectors lack the authority to ensure you receive a refund and can’t require that products, services, or advertisements--on the Internet or elsewhere--be alteredA" See for full details Fraud - Prevention DVDs
Anyone who actually used the United States Postal Service to mail Heidi K. Diaz a check (for your Kimkins membership or for those fictional "foster children") file a complaint for mail fraud- Mail Fraud On-Line Complaint Form