I think the term you are looking for is Lutino (not latino) meaning the bird is either white or yellow or some combination of the two. Do you have any idea how old they are? Even a Lutino hen will have very faint yellowish or brownish lines on two of the under-tail feathers. After the age of four to six months, the males loose the lined feathers and regrow only solid colored ones. Pearl marked birds who are cocks will lose their pearl markings slowly as they age, usually losing all pearl markings by the age of four years.
So, to determine if your birds are cocks or hens, if they are over four or five months old, the birds should have all solid colored tail feathers if they are cocks or if they are hens, they will have two tail feathers which are yellow and have black of brown bars on them. Cockatiels are dimorphic birds, but you have to wait for four to six months for them to get their permanent feather colors. All young birds initially grow the yellow colored and barred tail feathers. Very often the first thing that tells a breeder they have a cock is the young cock will begin singing or whistling at three months old while the hens tend to only have a one note call and never sing. There are exceptions to this rule; there are some hens who will sing and also talk English; we have one here on the Avenue whom we refer to as the Queen of the Universe and her name is Samantha: her owner is Anne who lives in Ontario and Anne greeted you above in a note.
I would definitely remove the breeding box and rearrange the cage to indicate the birds do not need to worry about breeding. Right now, you need to concentrate on making friends with each of them; first by talking to them and giving them treats, and later by getting them used to being handled. If they were strictly breeders, they may not be used to being handled and may nip or bite when you try to pick them up or teach them to step up. You can teach them to step up by holding a six or eight inch of perch in your one hand and placing it lightly next to their lower abdomen, above their feet, while holding a treat on the side of the perch nearest you. When they reach out to take the treat, GENTLY push the perch against their tummy and say "step up" and once they place both feet on the perch, let them have a bite of the treat. Once they step up on the perch, you can use a finger and get them to step up on your finger/hand when you say "step up". There are just starting ideas.
Do your birds come out of the cage yet? If so, do they step up so you can put them in the cage or do you have to chase them? Teaching them to step up on command really makes it easy to put them back in the cage.
Anything else you want to discuss?
and 
Beautiful tiels