There goes my hypothesis! I thought perhaps the two freebies were from the blue parent line (after all, they have to be maintaining lines of blue and barred chickens to make the F1 crosses, right?)
Wow, those two certainly stand out. I hope you'll update when they get their rooster feathers because that certainly isn't what I'd expect to see for sexlinks.
I'm going to guess that it's like many other businesses where customer service is either outsourced or compartmentalized. The person you reach isn't in the chicken business, they're just fielding calls with a booklet of scripted answers. Ask something that's not in the script and they have to...
Moonshiner shared the info and pic on pg. 2. The pic is grainy but I found the same one on another supplier's site and it was slightly more clear there. The cock definitely has barring.
Someone earlier in the thread provided evidence that the males have a single barring gene just like a black sexlink does. So, I'd look for a spot on the head to indicate male.
Most feed stores order sexlink pullets, not straight run, and (in general) blue chicks range from pastel to almost...