Record current citizenship using appropriate citizenship evidence and travel documents. Keep the Canadian PR card identified as evidence of Canadian permanent residence, not proof that the TN citizenship condition is met. If citizenship changes later, update the employer and application records before relying on the new nationality.
Avoid a misleading document bundle
A Canadian diploma, provincial identification or Canadian employment history may address other facts but does not establish Canadian citizenship. Organize the file so each record has a clear purpose. For a Mexican citizen resident in Canada, confirm the applicable visa procedure and its required documentation instead of copying a Canadian border-application checklist.
Do not discard useful academic and employment records while resolving nationality; those records may still help assess professional fit, although they cannot cure a missing citizenship requirement. Assemble the bundle so that it cannot mislead the reader who receives it. The risk with a mixed set of Canadian documents is that a permanent resident card, a provincial licence and a long employment history together create an impression of Canadian nationality that none of them individually supports.
Label each document with what it evidences. Include the passport of the citizenship actually held, since that is the document the process will turn on, and check its expiry against the period under discussion. Where a name differs between documents because of marriage, transliteration or an administrative variation, obtain the record that links them rather than leaving the discrepancy to be noticed later.
If a citizenship certificate has been lost, begin the replacement request immediately, because it is generally the slowest item and nothing else in the file substitutes for it.