Keep a dated copy of the page showing the nonrefundable processing fee, the gift amounts and sequence, the family terms, the I-140G process and the EB-1/EB-2 gift-as-evidence framework, together with the official instructions and receipts received in the case.
Keep the version of the terms you relied on, with the date
Because the official page can change and the processing fee is described as nonrefundable, the Torbay couple should preserve a dated record of what it said on the day they decided. That record should capture the US$15,000 per-person processing fee and its nonrefundable status, the US$1,000,000 individual gift, the terms for a joining spouse, the order in which application, fee, I-140G submission, vetting and gift occur, and the statement that successful applicants receive EB-1 or EB-2 classification as appropriately determined. Alongside it, keep the official portal and USCIS correspondence, the completed I-140G materials and receipts.
If the official page is inaccessible, record the attempt and try again rather than relying on an intermediary or news report. When terms change between the decision and payment, the couple should re-decide on the new terms rather than proceed on old ones. None of this paperwork substitutes for the government's instructions at each stage.