I don't know if there's any way to tell if the melon you ate was a hybrid or not... seeds from hybrids won't generally be true to type. But seeds from a hybrid cantelope will still produce cantelopes (if they grow), and some may turn out to be much the same as the hybrid parent.
Do you have some more info on the original melon? Was it one you grew last year (if so, do you remember anything about what it was)? Something you bought from the grocery store and saved seeds from? Some more info might help figure out how good your chances are of getting the same thing, otherwise the only way to find out for sure is to plant them and see what you get!
LOL, that will be fun!! A friend bought them at the farmer's market in another town. Don't know who the farmer was. The grower. They were about the size of a softball. Therefore, I thought I would/might have a chance at growing them thru to ripening. Thanks.