A current employer letter reflecting the present role, the current state licence rather than the original issuance, proof of Canadian citizenship, and the degree and transcript. The credentials do not change; the letter and the licence do, and presenting a two-year-old letter describing a role that has moved on invites questions.
Two documents age and two do not
The degree and transcript are permanent records. Citizenship is a stable fact, but a passport used as proof has an expiry date and must remain valid as required. The employer letter and professional licence also have a shelf life.
The letter describes a position at a moment in time; where duties, worksite, salary or the employing entity have moved, an updated letter is better than an explanation. An expired licence can prevent lawful practice and, where the licence is being used to satisfy the profession's TN qualification rule, remove that basis for eligibility. Keep a single folder, physical or digital, with every item in current form and refresh each document that ages.
Carrying only the original approval documents from the first crossing can produce difficult conversations in year three. Hypothetical example: a coastal-survey cartographer changes from field mapping to supervising subcontractors and prepares to travel using her original letter. Her first review produces an updated duty list, a fresh employer letter, and confirmation of whether any local practice credential is required.
The signed current description settles whether the work is still within the listed professional role; the licence record settles whether she may lawfully perform it. She should obtain those records before booking travel, not rely on a familiar title. A stale package fails because it proves yesterday's arrangement, while the officer must decide the work offered now.