If they were sold as sexed pullets then they most likely are just that. Wyandottes are tricky, as has been said. Keep an eye on them, and if you do get a cockerel, contact the hatchery or wherever they came from and try for a refund. Then put up an ad if you can't keep a rooster.
Sometimes the females can get bigger, colorful combs and wattles early in these two varieties. Not always, though.
I think GL-2 is definitely a female. I'd give a little more time for the other two. They are pinking up a bit, but I wouldn't worry about that. They just need to feather out more...
I'll post a picture. What I can see in the picture is that the gold color is deeper right at the shoulders than the gold color elsewhere, and there are also some gold feathers without lacing at all. Both signs of a cockerel. Comb and wattles are also large and red.