I, for one, would like to know more. If there was no hint given as to what the photos were of, 28% correct is phenomenally high.
Had anyone been correct, they would have said so.
"close guess" was used to try to justify the tests and the money spent.
A close guess is meaningless.
They didn't say 28% were correct. They said 28% made a close guess which could mean anything. Probably 0% were correct.