Originally Posted by
ozstamps
Now that's funny.
We've been in there 4 occasions in recent times, and each time I simply hand over some chits and a tip .. never thought to just hand over the tip.
Not sure if they have chits at desk, but they
do have T-mobile cards.

I suspect just the tip will do.
We actually met years ago on a ferry from Vieques to "mainland" Puerto Rico. I recognized the FT sticker on your bag.
I must say you do get around.