US Mint
The US Mint regularly responds to questions and concerns about products in the marketplace. Important issues are posted on their Web site, and updates are posted regularly. Please visit this link:
Consumer Issues [US Mint Web Site]

American Numismatic Association C.A.R.E.
The ANA’s C.A.R.E. program was established to help make the industry safe for collectors and investors. It achieves this goal by arming both members and non-members with knowledge through their many educational resources, fraud alerts, and awareness outreach projects, and by serving as an advocate to the public through their loss alert/reward program, mediation services, and partnerships with local, national, and federal law enforcement agencies. Take C.A.R.E. (Consumer Awareness REsources)