Keep the fleet sale agreement, closing statement, corporate and personal tax filings for the years the value accumulated, and brokerage or bank statements showing where the proceeds are now. The public official Gold Card material reviewed describes applicant vetting but does not separately publish a lawful-source test, so confirm the current I-140G document requests before applying.
Keep a prudent proceeds record and verify the current document request
The official program describes applicant vetting and an I-140G filing with supporting documents, but the public material reviewed does not separately publish a lawful-source-of-funds test. Walt should nevertheless preserve the purchase and sale agreement, the closing statement showing the price and its allocation, the corporation's financial statements and Canadian tax returns during the years of operation, his personal returns showing dividends or capital gains, and the bank and brokerage statements that show the money moving from the sale to where it sits today, then compare that file with the current I-140G request. If part of the price was paid over time under a vendor note, keep the note and payment schedule.
If a partner or spouse shared ownership, keep the documents showing how the proceeds were divided. This record is also useful if Walt later considers EB-5 or E-2. Do not send originals to an intermediary; submit documents only as the official process instructs.