If they would have read the info on the "How to" on SR they wouldn't have done that. I had no idea what a btc was nor a digital wallet really, for that matter until I got here and did a lot of reading. I also think it would be a little "safer" to use tor and then use the online mybitcoin wallet. That way, nothing touches your computer, or have 2 mybitcoin's one on the computer and one on their site. If you are using a hidden service like TOR, I think LE would have a tough time following the trail to you/us.