Some Observations:
The OP's situation is remarkably similar to a case in a recently published decision. Different enough they probably are NOT the same case, but oddly similar nonetheless. Unfortunately I do not recall enough information to quickly find that precise case (so far this year alone there are dozens of Federal Court decisions published about cases which are, at least in part, about immigration related misrepresentation, and scores more IAD decisions). If I recall correctly I probably discussed and cited the case (with link) somewhat recently, in another topic (time flies so I cannot recall how recently).
In any event, a PR made some misrepresentations in an application to renew her PR card but subsequently withdrew that application. Years later she applied for a new PR card. That application was approved and she was in fact delivered the new PR card. In the meantime, however, that process somehow triggered IRCC to do a review of the previously withdrawn application leading to an investigation and allegations of misrepresentation. Unfortunately I do not recall the case well enough to adequately explain what happened in detail. But as I recall, it ended badly for her.
I bring it up at this juncture to emphasize what others have observed about previous misrepresentations: YES, an emphatic YES, previous misrepresentations can surface and be a problem, sometimes a very serious problem, for a long, long time to come. Depending on the seriousness of the misrepresentation. Depending on the context.
And, to I reference that case to illustrate that the issuance and delivery of a new PR card does NOT protect an immigrant from the potential consequences of a prior misrepresentation.
Apart from that, historically the majority of citizenship revocation cases have involved misrepresentations made when the immigrant first applied for status to live in Canada, either in their asylum application or their application for PR. Citizenship revocation cases have been brought as much as a
HALF CENTURY later. There is no statute of limitations.
The latter is not to say that any misrepresentation hangs over the immigrant's head for the rest of his or her life. It depends. Any misrepresentation of information material to obtaining status in Canada, however, tends to be a problem which can come back and bite for a long, long time.
What Triggers Later Scrutiny For Previous Misrepresentation?
Obviously, any application to IRCC can trigger inquiry into previous representations which, if identified as suspicious, can in turn trigger a misrepresentation investigation. BUT there are many other things which can trigger inquiry leading to investigation leading to allegations with consequences.
Examples:
-- Clients of crooked consultant. Individuals who were a client, even well in the past, of a consultant who is investigated for fraud, are typically scrutinized. This may not be triggered until there is some interaction with CBSA or IRCC (application for new card, PR TD, or citizenship, or to sponsor family), but it is clear that CBSA and IRCC, even the RCMP, have been investigating thousands of immigrants because those immigrants were, at some point, the client of a crooked consultant. For example, see recent media stories about a B.C. based consultant who spent three years in jail for fraud . . . over a THOUSAND of his former clients have been investigated and targeted for revocation of citizenship or PR, hundreds already deported or otherwise abroad with no status to return to Canada. There is some litigation being pursued by a large number who claim they personally engaged in no fraud or misrepresentation and are being unfairly targeted just because they had, at some point, employed this consultant's services.
-- Fraud tip / poison letter. Someone submits information to CBSA, IRCC, or the RCMP about the immigrant, asserting facts showing there was some misrepresentation in the past. Whether the source is a vengeful former-partner, from a romantic or business relationship, a disgruntled former employee or employer or colleague at work, a mean-spirited neighbour or family member . . . way, way too many possible sources of a "tip" to authorities to begin enumerating more than a representative few. Former landlords. The local bigot. A friend in trouble thinking his troubles will be less if he offers information. The list is long.
An altered passport stamps case:
The Federal Court decision in the N Hoseinian 2018 FC 514 case, see
http://canlii.ca/t/hs2j7, may be of interest because it illustrates a situation involving allegedly altered passport stamps where the individual asserted she did not know the stamps had been altered and that nonetheless the dates indicated were accurate.
While this was a citizenship case, the issue was whether the presentation of the passport with altered stamps constituted misrepresentation (IRCC concluded she had, and that was grounds to deny the citizenship application). From the court's decision it is clear that N.H. asserted she did not know how or by whom the passport was altered, and she provided additional evidence confirming that she had in fact traveled from Canada to her home country on the date purportedly shown on the disputed entry stamp (that is, the stamp date was accurate EVEN if it had been altered). Her evidence included credit card statements showing that she had made purchases corroborating her account of where she was prior to the date she said she arrived in her home country.
Two aspects of this case are, perhaps, of particular interest. One is the outline of misrepresentation jurisprudence generally. This sort of information is also recited in numerous other cases, but for those not familiar with official interpretations of the relevant law, this discussion is a good start and should be informative; otherwise, for the rest of us, a refresher never hurts. The second aspect is the analysis of fact in this particular instance, facts relevant to whether there was a misrepresentation, and facts relevant to the decision-making about travel dates (including evidence to corroborate the asserted travel date was the actual travel date).