Looking at those birds Id also say they have some phoenix in them based on the white showing in the earlobes. The type is all wrong for sumatra as well, these are just a cross someone made and thought was pretty so theyre trying to make a buck off of them.
The khaki sumatras are the splash form of dun which acts just like blue and with a couple breedings you should have good birds. I think I know which auction youre talking about though, they had nasty type and didnt really look anything like sumatra.