According to the instructions for Form I-129F from the USCIS, you need to
I just barely received my (electronic) NOA1, so I'm not sure my answer will be very helpful, but I included a number of photos, flight and hotel confirmation messages, and photos of boarding passes (though I only have a couple, unfortunately, as I've misplaced some and used electronic passes when possible) as evidence in my petition. It sounds like our petitions are similar in this regard; I think I overestimated the value of photos as evidence. If I were to receive an RFE of this nature, I'd include statements from my fiancée and me, statements from family members of my fiancée whom I met during my visits to the Philippines, and scans of the stamps in my old passport. I'd also check my email and digital wallets (Google Wallet and Apple Wallet) for additional digital evidence, such as expired boarding passes and electronic receipts.
I didn't keep neat, tidy records of my relationship or my travels, and I'm regretting it now and a little anxious about the prospect of receiving an RFE. I'd be curious to hear how others approached similar quandaries.
