I understand and agree but why are they hiding the warrant with the patriot act? We can't even find out what they were really searching for! Even the family can't find out what they were looking for. Very odd.
That is one of the "features" (for a lack of a better term) of the patriot act. Everything is kept out of the public's view. I wouldn't be surprised if Burt and/or his attorney knows the contents of what they were looking for and possibly the basis for the warrant (this might not even be true - I am not that familiar with the law). I would say however if/when the case is resolved outside of court that a stipulation be that he agrees not to speak publicly about the case.
His wife said on the video on her website that they took over 700
BTC and $30,000 in cash from their home. I am somewhat surprised that he didn't have the
BTC better protected.
Why use the patriot act at all? Are money transmitting licenses regulated by DHS now? The only they would ever say what was in the warrant was if they found exactly what they were looking for.
Well that is the strange thing. There were a number of law enforcement agencies that were involved that probably shouldn't have been. I would say there is a good chance that the government at least though that Burt was involved in a lot worse things then what he was charged with. Based on the number of both agents and law enforcement agencies, they probably at least thought that he was somehow involved in Silk Road (I think he was arrested right around the time that the guy from SR2 was arrested).
As for getting the btc there is a simple way to do it that always eludes geeks.

Yea I get that, however the government is only allowed to do so much. I think it was said above that he was put in solitary confinement for two days (and his wife did mention that as well), so it is possible that he gave up the keys during this time.
I would think however that it would have been smarter for him to plead the 5th when asked how to access the private keys, as with the private keys the public addresses can be calculated, and with the public addresses, in theory it would be possible to link transactions to a crime that he was alleged to have committed, so giving up the private keys could be considered testifying against himself which you cannot be forced to do.