I don't understand why you are so quick to throw the baby out with the bath water. Yes the seller was deceitful in the representation of his stock but that does not mean that they aren't decent quality. Show quality birds don't reproduce show quality birds 100% of the time. They cull hard and might only have 10% keepers. You don't have an eye yet for day old chicks. You should keep all of them. Grow them out to 6 months then make your first cut. You should know by then what you've got and if it's a decent starting point.
In this case it's not a matter of quality of breed, but a matter of breed period. She thought she was investing in a certain breed, not only is it not the breed advertised, but apparently looking like crosses. Nothing wrong with finding them homes if she has buyers.