The acquisition records for the land and equipment, the sale agreement, proof of each instalment received, banking records for every subsequent transfer, and the tax filings reporting the disposition.
Assemble the chain in both directions
Work outward from the sale in two directions. Backwards, establish how the assets were acquired and paid for, since capital derived from an asset inherits the question of how that asset was funded; deeds, purchase agreements, financing records and historical tax filings do that work. Forwards, follow every dollar from the buyer’s payment into the investor’s account, through any intermediate accounts or currency conversion, and into the enterprise, with statements covering each step rather than opening and closing balances. Include the tax treatment of the gain, because a reported disposition corroborates both the amount and its legitimacy. French-language documents require complete certified English translations, and translations should render the originals faithfully rather than summarise them.
Hypothetical example: a composting-facility buyer receives a gift from a parent shortly before subscribing to a project. Keep the gift instrument, the donor's lawful-source records, transfer confirmations, account statements and the recipient's subscription documents in one chronological file. The first review should produce a gap list showing which record proves origin, which proves movement, and which proves the funds reached the enterprise. Decide whether a missing document can be recovered from a bank or public registry before filing. A simple narrative that money was available is weaker than records connecting each stage without unexplained detours.