Earlier quoted context omitted.
So when i read that a suspect was seized by police; They might have just recovered a picture of the person..? But then the real person can't change addresses as they would be charged with escaping from police custody.. Doesn't seem right.
I think that when you read that a suspect was "seized" by police, the person writing it doesn't know what "seized" legally means, and they should have said "arrested" or "taken into custody" or something.
But i would say that taking public keys doesn't fulfill the "removes property from an individual's possession" in the law.cornell.edu link. There is no way to 'remove property from an individual's possession" while "leaving property in an individual's possession" at the same time. And if you are have done the second one of those things then you have failed to do the first.