Everyone should always be checking all their credit card statements, regardless of travelling or not. If you have been following the news, millions of credit cards' information have been hacked from major retailers all over the US due to computer security breaches. This information is available for sale on the internet.
Since the cards were not used in Jamaica for any transactions, and the scanner technology and card duplication systems are rather costly and only work when you are in close proximity, it is possible that the credit card information was purchased online.
Flip - I know the owners of G-Link, they build decent machines and I have been recommending and repairing their machines since they started. If I can help from this end, please let me know. Also, since you were here for the Dream Week festivities and may have been in close contact to many strangers at some of the parties, did you both physically have the cards on your persons during this time?
If not, then the breach probably came from the US retailers who compromised their patrons credit information.
Regardless, everyone should be checking their credit card statements each month, travelling or not. Credit card fraud is a huge illegal worldwide business.
