Once the big bad Amazon got accustomed to the site of the Four Big Drawers foraging thingie and saw the yummy nuts in there, it was easy as pie to open for Wasabi to open. I very much recommend it for beginners. I think W is bored with it now, lol.
Oh, I did not exactly answer: it took him 5 seconds to open! To start off, I put a big nut (almond in the shell) in one of the top compartments and closed it. Once he opened that, I put another nut in the compartment below and closed it so that he had to work a bit harder to get at the drawer below. His perches are placed on either side of the box and it is a bit harder to get at the lower compartment. But he's a nut 'ho, so he'll do what it takes.
What is really easy is to put a treat in a paper cup, show him the nut going into the cup, give the cup a couple of twists, put it in one of the drawers and close the drawer.
The cup is an easy reach when it's in one of the drawers.