We panicked when we got pfl but managed to gather documents from period of filing of application to July. Evidence we sent: very thorough letter of explanation, joint affidavit with immigration lawyer, phone call history, credit card statement, testimonial letters from family, friends, and third party, signed paper from neighbors, any trip Itinerary, gym membership, medical visits, copy of CRA notice of assessment, driver's license, car insurance, life insurance beneficiary change, rrsp/tfsa beneficiary changes, costco transaction records, electricity bill, gas bill, receipts of household item purchases, pictures taken in public functions, and some other personal documents showing the same residential address.