I say again: All this "it's hazardous" crap is just intended to scare away ignorant souvenir hunters. If that pyro didn't blow in a 5000 degree fireball from 207,000 feet at Mach 18, then it's not going to blow when you pick it up.
There was no radioactivity onboard (other than the smoke detectors in the crew cabin), and the contents of the potty were thoroughly sterilized in God's Autoclave.