FMM Requirements - Free 7-day Visitation Visa?

You are flying within Mexico so you won't have an FMM attached to your ticket, you bought it when you crossed the bridge. You'll need it when you exit with Alaska.

We entered Mexico on 9 January, via Alaska. We were given no FMM card as in previous years.....just a stamp in our passports showing 180 days each. So there's nothing to surrender when we leave, except to show our passports.