One other technical point about the "destruction" of evidence: The "evidence" is what they can see across the network connection.
If law enforcement can no longer "see" the files, then they have no basis on which to get a warrant to try to find out whose computer the files live on.
Which, of course, assums that someone in ChocChipCookie's family has the gonads to contact the FBI about getting a warrant, which, to date, we haven't seen any evidence of - but, anyway, as things stand right now, the judge has no reason to grant the warrant.
The only “report” I have is that I’ve passed along some of the suggestions on this thread to my SIL. I’m glad I didn’t give her the link to read everything because that would scare the crap out of anybody. Remember, many Freepers suggested they destroy their hard drive and gave specific directions for doing so along with some hysterical posts about finding new homes for their kids since the Feds were surely on their way. Since it’s their computer, their home, and their lives that are involved, it’s also their decision as where to go from here.
As far as securing their network, that’s not stupid, it’s common sense, no different from locking your front door. It’s the first thing I would do if I discovered that my neighbor was accessing the internet via our wireless, regardless of what they were looking at. I’m certain the FBI have sophisticated means to backtrack from their computer if need be.