It was 30k that Draper bought earlier in the year. However, to some HNW individuals these are worth more than "normal" market-sourced bitcoins, because the US Marshal's coins have been laundered by the government.
There was some talk to that effect on this thread, at the time. Some even wondered whether those coins would become prized collectibles, "the bitcoins seized from SilkRoad".
However, the people who put up actual money for them probably believed in the fungibility of bitcoin. As for the historic value, I doubt that people would line up to see them.
-- Rosie, would you come to my apartment to see my SilkRoad-seized bitcoin?
-- You mean, a physical coin?
-- Well, no, it is on the blockchain. But it can be traced back to the first USMS auction.
-- Then we can see it here, on your iphone, no? Show it... hm... wait, there, isn't that BTC-e's hot wallet?
-- Well, yes, but I have a notarized certificate attesting that this 1 BTC output you see here comes from that 3000 BTC input over there, and if you backtrace that...
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