Quick update: A few hours after sending my "Missing Miles" form, I received an email saying "By the airline's policies, we need your account information so we can verify the account..." They asked for all the stuff already provided in the Missing Miles form (first name, last name, etc.) plus full address and date of birth. 🤔 That sounded insanely scammy to me, but I provided it anyway. That was Sunday, and there's no further progress today (Tuesday), but I guess we'll see what happens.