Would it be ironic if the US Treasury was the secret bidder on the FBI auction of the seized Silk Road coins?
As they can print as much fiat "money" as the want, they could pretty much buy up Bitcoin if they so chose. Any left over Bitcoin (in the US) could be seized.
They have plenty of ways to largely take over bitcoin, if they wanted to. I don't really see why they would do it by buying small tranches in the Feds auctions.
It would be very interesting though. I would rather it be a big investor, like a Bill Gates or Warren Buffet though, but that also seems unlikely.