The white ones seem to be one silky cross and one polish cross. The one in the back seems to have dark skin while the other looks way to light in skin color to be silky, but who knows. The tops seems to small to be polish... maybe a silky crossed with polish and something else?
The second one, a little dark to tell much, but seems to be a silky/RIR cross.
I usually wont buy anything from auctions and farmer's markets... most people are just trying to get rid of their mistakes and unwanted birds and have no problem in wanting to fool the unsuspecting buyer into buying something that is completely NOT what they say it is.