That's too bad, IowaKaren.
My dad just got back from SP with a similar story. He left his carry-on in the taxi in Belize City on the way to SP. Luckily it didn't have his passport, but it did have some cash. When he checked in for his departure trip home at the AA counter, the lady told him that someone was looking for him. The taxi driver appeared with his bag and all of his belongings including the cash. There are lots of good folks out there, so hopefully your items will turn up, too.