I've never heard of a GSA gold hoard release is this just a marketing ploy?

I was browsing the auction archives at Heritage and came across a group of coins that I had never heard of. They were 2-1/2 dollar Indians slabbed in an NGC holder with the GSA attribution. This makes no sense to me in view of the fact that when gold or bullion was recalled by the federal government in 1933 it was melted into ingots for storage at Fort Knox. I know that in the past dealer's with enough coins to grade and cash to spend can have essentially any attribution placed in the slab. Some hoards are real and some are not. He is anyone from earlier with this particular NGC insert?

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