Gold laced chicks 8 weeks old Pullet or roos????

[dirtyweasel]

Hello every1 have hatched 9 chicks - gold laced wyandotte. 3 have flat but large combs which are dark red, 6 have raised combes but they are yellow. Am in a dillemma as the ones with flat combs look more like boys (to me not that experience!!) but have been told that the ones with raised combs are roos!! The raised combs are still yellow where as the flat ones r dark red. Can any1 help so that i sell the correct ones?!! will be gutted if i sell what i think is roos only to find out they were girls! can email picks if any1 will help!!
thanks
SAM