It's my understanding, and anyone can do the research to prove otherwise, that we have gold reserves all over the US. I recall that several billion dollars were stored beneath the World Trade Center, Chase Manhattan Bank in NYC, San Fransisco, etc.... I would guess that only a handful of folks actually know that amount that's secreted away....Fort Knox is just one repository for the shiny stuff..
For Y2K, the treasury printed an over abundance of paper currency just in case the SHTF after the year 2000, (even though the new millennium didn't start until Jan 1, 2001...the bothersome Gregorian calender and all)...and stored it all of the US as a precaution.