I've had several customers over the years who've lost items in transit in Belize. All (as far as I remember) small high value items like cameras, dive computers, etc, and all (again, as far as I remember) on water taxis from Belize City to SP.

I watched one of the water taxis unloading baggage in SP a year or so ago. One rucksack fell into the water between boat and dock and they left it there for at least 10 minutes while they continued to unload the rest of the stuff. AFAIK the bag wasn't accompanied, so the owner probably never knew the full story. I also received a box of papers from Angelus Press that was soaked and just pulp paper when it was delivered to me without any comment.

But to be fair such incidents are pretty rare.