If an officer seizes something from you, they have to give you written notice explaining the grounds. Where the thing belongs to someone else, the officer must make reasonable efforts to find the real owner and notify them too. A mailed notice counts as delivered on the seventh day after it goes out, which matters because the deadlines to get your property back run from that date.
(1)An officer who seizes a thing under subsection 140(1) of the Act shall provide written notice to the person from whom it was seized, including the grounds for the seizure.
(2)If the person from whom the thing was seized is not the lawful owner, the officer shall make reasonable efforts to identify the lawful owner and to give the lawful owner written notice of, and the grounds for, the seizure. If the notice is provided by mail, notification is deemed to have been provided on the seventh day after the day on which the notice was mailed.