Rural King, Tractor Supply, Wendy's, Starbucks, Ideal Hatchery, Trader Joe's, Home Depot; they are all staffed by people. Some people are better at their jobs than others working at the same place. All people are capable of making a mistake, especially me. I don't trust any person, let alone any business run or worked by people, to be correct 100% of the time. I think it is always wise to question, to not blindly trust what anybody says. I can think of one person at one specific Tractor Supply I would not trust about anything, yet there are a few working there I do trust.
I'm not sure those are ISA Browns. They look like they could be but there are a lot of chicks that could be. You just need to do the best you can, can't do any better than that. At some point you have to have trust until proven wrong.