"In 2017, the public found out that the U.S. Mint was secretly minting a small number of Silver Eagles at the Philadelphia and San Francisco Mints due to a Freedom of Information Act. Only 79,640 of the near 50,000,000 2015 Silver Eagles were minted at Philadelphia. That's about 1/10th of a percent! This is the single rarest Bullion Strike Silver Eagle in terms of mintage. Keep in mind, many of the sealed boxes that were minted at the Philadelphia Mint were opened prior to this information being released in 2017, which means those will never be graded as a Philadelphia coin, which just adds to the rarity of this piece." First off, is there truth to this? If so, why, and what were the S mintages? Second- any idea how to tell the Philly & SanFran pieces apart from West Point issues?