Whoever sent these packages via Fed Ex had to pay Fed Ex last I checked they did not deliver packages for free. For an underground group to have accounts suitable for mailing all these packages via Federal Express is beyond credulity. If this is unsolved within hours then one must presume that the group behind this is also the package recipients.
In any case anyone committing an anthrax hoax should be spending the next twenty years as the guest of the government.
My guess is that it is is PP itself doing the mailings and when someone gets caught they will argue that it was necessary to bring attention and security.
Stay well - Stay safe - stay armed - yorktown
One issue we've had at my company is people stealing FedEx account information and sending packages on our nickel. FedEx doesn't car, they say the account holder is responsible for protecting the information.