My vote: Pullets. At 18 weeks they'd have much bigger combs and wattles. My baby roo had a bigger comb then yours when he was 5 weeks. That's great you got female "packing peanuts", that's very rare.
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I ordered from My Pet Chicken and I read on here somewhere, which I didn't know - that if you ordered just hens, then if any extras are shipped they will be hens too. I think that's great! Thanks everyone for your replies!