In the circumstances you've just described, you've described what is, effectively, a section 810 offence, so possession of something contrary to an order telling you that you're not to do that. There is a similar part III offence covering more or less the same subject matter, but....
I don't want to mislead the committee in saying that the investigative process that you described occurs in every case. That may not be the case. Investigative steps are at the discretion of the investigating agency, but it would be dealt with as a criminal matter.
In the way that I described earlier, if it formed the subject matter of a charge, at the end of a trial there's an opportunity to see those things forfeited. Usually that's what happens. They're similarly granted as a matter of course, in my experience. Once they're forfeited, again, they become subject to a disposal regime.