cag breeding

Hi,
I have a pair of Congo African Greys using nest box.they very secretive.
Hen don't come out that much....cock does a runner every time I get close to
there bird room.
put baby monitor up to listen ..early hours in the morning I could hear them
I think mating.
This has been going on now for a week.
When should I look in the nest box ?
Some books say once a week some say don't look at all.

At the moment I am hand rearing 3 Orange Wing Amazons what an experience it
is.
You don't realise how much time it takes up.
My wife was meant to help but done it all by my self, now got them on 8hour
feeds.
African greys or a lot different to my cockatoo's and my Amazons.