you should have them trapping well before you start training, taking old birds won't help them trap as the old birds will trap and leave the youngsters out!
What you need is the birds to leave the basket, get home and in the loft asap!
When you first start letting the birds out at home training starts then, controlling the food so that when you want them in they come straight in, once they get the habbit they will continue to trap well!
Phil