The evidentiary support for the search and seizures is the sworn testimony by U.S. Postal Inspectors that there are few legitimate reasons for Bitcoins; therefore, anyone with Bitcoins is mostly likely engaged in criminal activity.
Here's what I would do, Jean, if I were in position to do such. Since the USPS has taken the steadfast position that Bitcoin is used mainly for criminal activity, then they should add to their formidable list of restrictions -
https://www.usps.com/ship/shipping-restrictions.htm - anything related to Bitcoin, e.g., miners, checks for bitcoins, periodicals, etc., for it's obvious to them that this Bitcoin thingy should be stopped in its tracks by all means and at all cost. Surely, the USPS doesn't want to be party to such activities by continuing to process Bitcoin-related mailings, hence their public position, ergo in the name of protecting the public, Bitcoin-related mailings should be 100% restricted. If they don't follow through with this concerning proposal, then by default there's no concern, and the USPS will have fingers pointed at them for causing an uproar when one wasn't warranted. The beauty part of this is that the fingers mentioned will be attached to hands belonging to those on Wall Street.
Again, I'm not one to start such a campaign, but hopefully those in unique positions able to read through what I've proposed will pick up the mantle of what I've outlined, in retrospect calling their bluff (for lack of a better term).
FWIW, I mentioned Burt in a post penned today pertaining to BFL using BitPay as an exchange to convert $10M+ USD worth of bitcoins to fiat that was deposited in some unknown bank under Sonny Vleisides' control. Surely, whatever Burt supposedly done nowhere reaches that magnitude.
Finally, thread related, there was the first ever NCAA Bitcoin St. Petersburg Bowl last year. I'm sure that the USPS garnered a few hundred grand worth of mailings directly related to this one event alone over the course of months leading up to the event, along with subsequent mailings after the fact. Oh, did I mention that the USPS is currently being used again for mailings as the second Bitcoin St. Petersburg Bowl for later this year is just starting to get geared up.