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Gold was confiscated only because the Fed needed more physical gold in order to inflate the currency. Since the end of Bretton Woods and the nominal link between good and the US dollar in 1971, the risk of confiscation has fallen to essentially zero. Our currency is already so debased that any attempt to apply a gold backing to it would necessarily be strongly deflationary, which would be even less appealing to the Fed in a crisis wherein its instinct is to expand the money supply at any cost.

If you want to be scared, look at the M0/M3/money multiplier data from the St. Louis Fed website. The US dollar as a store of value died in 2008-12 due to runaway inflation. You might point out that inflation was exceptionally low during those years, and you'd be correct, at least from the perspective of ants like us. However, the Fed's own data shows M0 increase 300% while the money multiplier goes from 1.3 to 0.74 overnight. In plain English, the Fed bought up the banks' gross negligence (i.e. toxic debt) with newly printed dollars which the banks then stuffed into their figurative vaults. We never saw inflation because the normal propagation of money that naturally occurs in a fractional reserve banking system ended in a matter of weeks in late 2008.

Taking your 10 oz gold bar and then claiming that the dollar is now backed by gold, presumably to quell popular fears and the great of hyperinflation, would backfire because they'd have to publicly claim that a $14000 gold bar was in fact worth a millions, which would put the scale of the problem in terms that even Joe Sixpack can grasp. They want that like they want syphilis.

Banks are terrified of runs above all else. This is a move that we can and should punish severely.