It doesn't say if they don't complete it or not.
Their cab was stolen, so it would definitely mean that they didn't do the ff.
We know they didn't do it, we see them at both a Detour and a RB!
yeh, it kind of confirmed that they did not do the FF.
And considering that they had to backtrack to RB and started all over again, got taxi stolen but still caught up with Tim/Marie at pitstop, seems they ran this leg really quick!