From what I understand the actual e- cat modules are in 3 separate enclosed boxes embedded in what we see here. The modules themselves were not opened (Rossi claims he wants to keep their content a secret), but they are quite small. Not big enough to contain any batteries or other ways to produce the output (you cant even see them in the picture.So, no radiation? Or Rossi lied saying that it does produce?
One might probably be lead to assume that any residual radiation is contained by that.
They also had a cooldown period. So most of any residual radiation outside the "black boxes" is probably gone by then.
Just one guess at an explanation for the lack of radiation. But then, your guess is as good as mine.