Tetra Tints (not tinted tetras) are a cross between a white Leghorn and a Rhode Island Red. Because of the Leghorn in their heritage, they will get large red combs much more quickly than other birds, so don't let that scare you. I believe that these are feather-sexable, so the hatchery was probably close to 100% in sexing these chicks and you most likely don't have anything to worry about. I like my Tetra Tints--not the prettiest birds, but they are wonderful layers.
Your Comets are sex-linked birds, so I would be surprised if you got any males. They are easy for the hatchery to sex. If you get a white bird with red patches on its wings, you'll know you got a male. Females will be red all over with white feathers here and there.