Vets/Techs wanted: FeLV question?

If you are having doubts then you should call the Vet and ask what they meant. I read on here on another answer a few days ago something about testing again in 9 weeks or something because the first test could be wrong, or something like that. I'd say if they are healthy and robust as you say, then get them tested at another Vet or call the first Vet and ask as many questions as you can think of.