I do not know - maybe some senders make their own problems? In past two years, I have received several boxes from TradeEx and from Cabela's - I have no clue what they told Canada Post might be in those boxes. I have also received and sent at least several dozen other boxes to and from people on CGN - I do not know what they said on their end, but every single time that I took a SnapShip package to the local Post Office, was never one question from them what was in the box. If I had not prepared the parcel with a SnapShip label, every time I get asked if I am shipping Dangerous Goods - the answer is "Yes" or "No" - I key the answer into that little payment machine - has never been any other question, nor would it be answered. Some of those boxes contained rifles. Many did not. I presume that some Postal facilities may have the capacity to scan parcels - like airlines do at security check-in for carry on - but I have never found that out for sure - is definite that our local Post Office does not have that.
In 1980's (?) I remember ordering from SIR catalogue in Winnipeg - as per the "rules" then, we had to mail our FAC card with our paper order form and the payment. That card would be in the box with the order that we received some weeks later. Seemed pretty simple - do it and get your order - or don't do it and then do without - up to the buyer, I guess.
Perhaps four or five years ago - before Canada Post's "new rules" - I received a rifle by mail in a plastic "hard case" that was closed with zip ties at each locking point around the perimeter - as I recall, my mailing address and sender's return address were on a card or paper that was taped on outside of that case - it came by mail from Ontario. Other than that, every other rifle that I received or sent has been in a plain cardboard box - with reams of tape holding it closed and nothing on exterior to indicate what the contents might be, except perhaps the name of the sender on the return address.
Some CGN posters have claimed that there is "different rules" for a commercial entity than for us "normal" Canada Post customers. I have seen no evidence of that at all. Many of the rifles that I receive or send from CGN people are dismantled or partially dismantled - to what, exactly, is a "trigger lock" to be attached when the trigger is on one component in the parcel, and the trigger guard is on another component? I did receive a rifle from Cabelas with a trigger lock - the key was taped to inside flap of that cardboard box - I suspect that made someone feel all warm and fuzzy and safe - was a waste of time and cost, so far as I was concerned.
Perhaps is what I have been "getting away with" versus what some rules might say. What would I know??