As I noted, there are very few reports about PRs not issued a 44(1) Report at the PoE who are later subject to a RO related investigation based on a referral from the PoE . . . UNLESS or UNTIL they engage in a transaction with CBSA (border crossing) or IRCC (typically an application for a new PR card). Few reports in the forum. And, significantly, also not commonly seen in actual cases reflected in published IAD decisions (recognizing that not all PR RO cases clearly indicate how the PR was Reported . . . but also noting that, per a rough estimate, it seems there are many more PR TD application denials appealed than 44(1) Reports).
So it does not seem to be a common practice. Which suggests, but is far shy of a guarantee, that not getting issued a 44(1) Report at the PoE basically means all you need to do is wait for two years and the previous breach is cured.
I cannot advise whether or not you should contact IRCC. I do not give advice (except to the extent I repeat banal platitudes or restate definite rules). I would approach any advice offered in a forum like this with much skepticism since this really is NOT an appropriate forum for seeking or giving advice. Basically, if advice here is what is consistent with both official and authoritative sources, yeah, that's not really advice, that is restating what IRCC information says. Otherwise, advice here is not to be trusted.
That said, I am not sure why you would contact IRCC at this stage. Canadian PRs do not need to inform IRCC of their current address (unless they are involved in an active proceeding, like applying for a new card or citizenship).
As for the chances you were "reported" . . . if you were not formally issued a 44(1) Report, that is the key thing.
Odds are there was a "report" . . . but again perhaps only in the sense that a note or record or flag or alert, whatever the label, was submitted into your GCMS records. That would mostly be about making a record. That would NOT likely cause any further action to be taken (as I've outlined) UNLESS and UNTIL you engaged in a transaction with CBSA (border crossing) or IRCC (application for new card or such).
This should be of little surprise. I do not know what the parameters are, but there are still many indications that PoE officials can be quite lenient about enforcing RO compliance. A PR is still a PR. If the PR is coming into Canada to stay, well that is what Canada granted PR status for, so the person could settle in Canada. If the PR is not coming into Canada to stay, they will soon enough be engaged in another screening, at the border or while applying for a PR TD, and the flag in GCMS should suffice to trigger tougher enforcement if, in the circumstances, that appears warranted. Of course the PR can also, always, force a formal RO compliance determination by applying for a new PR card.
But at the PoE it can be a bit like driving over the speed limit. We know there is always a risk of getting a ticket when we speed, but trying to articulate quantified risks for going between 10k and 40k over the limit, there are lots of variables, including law enforcement priorities which can vary from week to week.
There is a chance the PoE officials made a specific referral to IRCC (more than just flagging GCMS) . . . and even though it is more likely no action was taken on that (again IRCC seems inclined to wait to see if the PR engages in another transaction), it is also possible a formal investigation was commenced. And if so, that could be in limbo (again waiting to see if the PR engages in another transaction), in which case it is OK to do nothing to trigger action on it (until you have been IN Canada for two years and have cured the RO breach), or it possibly could have resulted in a formal determination after notice was sent to your last known address. So I cannot rule out the latter. It is possible. Trying to quantify the odds is not going to illuminate much.
NOTE about updating addresses: the Canadian government is not monolithic . . . nowhere near. Updating addresses with Quebec authorities has nothing to do with federal agencies. Providing up-to-date address information to CRA has nothing to do with IRCC. Again, PRs do NOT need to keep IRCC informed of their current address unless specifically asked or unless they are involved in an ongoing proceeding (like PR card application or citizenship application or if they have appealed a Removal Order or such).
