Keb' Mo' who plays Gabe sings his song "Tell Everybody I Know" in the next movie Signed, Sealed, Delivered: Home Again (2017) during the opening credits.
This movie clearly takes place in 2017 - twelve years after Katrina in 2005. But the movie also takes place about a week or two after the previous movie (which aired Sept. 2016, but seemed to take place in Feb/Mar 2016), as the deceased passport employee's potato hasn't yet sprouted (and that takes about 1-2 weeks). That creates an inconsistent internal timeline for the movies.