Prefer contemporaneous records where available. Recreating a missing history can create credibility problems if it is presented as older than it is.
Preserve provenance and explain limits
Inventory the material the company already has: training enrolments, learning-management records, project tickets, deployment notes, performance reviews, technical presentations, and role changes. Identify the date, author, business purpose, and system from which each item came. If a supporting declaration is prepared now, call it a current explanation and connect it to earlier records; do not disguise it as a historical document.
Some internal teams will need time to retrieve records from archived systems or to redact sensitive information, which should be included in the budget and timeline. The expense of a technical expert, translation, or document management may be appropriate, but spending money does not make weak proof persuasive. The important distinction is between an honest reconstruction of facts and a manufactured paper trail.
If records are unavailable, say why and obtain alternative evidence from people with direct knowledge. A file that acknowledges practical limits while supplying specific, verifiable examples is usually stronger than one filled with polished but untraceable summaries. If the company commissions a technical explanation, ask the author to identify their role and information sources.
A costly report should clarify the particular knowledge and its U.S. use, not simply repeat conclusions. Retaining its working materials can assist if a later question arises about a statement or date.