I bought a proven pair lutino ringneck, my male always makes a mating calls, the female always inside the nestbox, I don't know what she is doing in there, haven't seen them mate yet, but one day I saw the female droppings as liquified and more but normal colors, it maybe a sign that she is pregnant, but after she saw me near the nest, he became very aggressive and no longer enters the nest, only the male do, I check it and no eggs found. What may be the signs of preggy or mated ringneck? Do I still have to give her nesting materials aside from wood shaving? Thx:)

Proven means that they've been able to create chicks before. Is that what you were told?

Lutino Ringnecks are so incredibly beautiful. I have a pair, not lutino. I have tried both wood shavings and shredded paper in their box. They throw most of it out. Having a divot, a dent in the box has been recommended because they sit on their eggs so hard.

Do you feed them egg food? When a hen is making eggs she needs extra calcium. Your birds are doing all the right things. Just be patient.

My nestbox is very deep and they can put the nesting materials out, this pass few days my female was always inside the nestbox, comes out only at am, some of my friend says if I heard a chirping sounds that would be the time I check the nest, maybe the female does not want me to look at them hehehe, privacy I think
Ialso gave them fertivit, egg food and cuttlebone.