You can ‘verify’ the presence of something somewhere, but you cannot ‘verify’ the absence of something anywhere. Verification is an absolute thing based on proof. It’s not a probabilistic thing based on odds (unless those odds are practically zero). How many channels of communication have you monitored, and what assumptions are you making?
As far as I can tell, these proposals have been adopted without verification, which seems to be a recurring pattern. This concerns me (which is the only reason I’m mentioning it - I’m not trying to be intentionally difficult).