First determine which fact needs explanation and who can reliably confirm it.
Target the evidence expense
An unnecessary reissue may not resolve the relevant qualification issue. Separate legitimate record costs from official filing charges, and do not buy a fabricated employment statement to fill a gap.
Identify the disputed fact before commissioning anything. If the issue is only a legal-name transition, a corporate extract and a concise issuer clarification may be more useful than buying a full replacement letter. If duties or dates are missing, ask whether contemporaneous payroll, tax, licence, or project records already establish them. Obtain a scope and price from any credential evaluator or translator, and keep those service charges separate from government fees shown on the official schedule. No expenditure cures a category mismatch: TN still requires Canadian or Mexican citizenship, a USMCA-listed profession, its particular qualification, and prearranged US work that is not self-employment. Canadians generally apply at a port of entry or through Form I-129, depending on the chosen procedure.
Hypothetical example: A geologist based in Rivière-Éternité is quoted for several new employment documents after noticing an outdated corporate name. He first confirms that the historic letter, tax slips, and a public name-change record already connect the employer. His remaining budget goes toward a necessary foreign-degree evaluation and accurate translation, because those items address the geologist qualification. He refuses an offer to create a backdated reference. The spending plan follows evidentiary gaps instead of paying for a cosmetically uniform file.