1) One of the people who might just left on a cruise.
2) No such casino is listed on the Caribbean Casino Chip Guide: http://www.caribbeanchipguide.com/casino.php?cntrycode=CUB&sort=casino
3) I believe there are a number of unique items from Cuba (so I have heard), so what would make that chip the most rare? Can't back that up, though.

Maybe a Cuba collector can chime in?

Michael Siskin