Probably because it doesn't have one. Looking at the rear seat area, there is no place for a top to fold down. Without pictures of the trunk area, it's hard to know for sure but I'd be amazed if this car has a top at all.
Brian, you are correct. I remember seeing the eBay auction put up by Ford, to benefit some charity. As I recall, it did not have side windows or a working top (or maybe any top at all, I can't accurately recall). And the eBay listing was FULL of disclaimers like the one pictured.