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OK, first I will recognize that all posts here are from owners who legitimately want birds to die the least traumatic deaths possible when necessary. I applaud everyone's empathy for these little critters we all love so much.
BUT: Are you kidding? Being locked in a small, dark box and then choking on car exhaust until passing out is a peaceful death? This is nuts.
How peaceful do you think it is for an animal to have its owner who is obviously wound up and nervous at the time place them in a foreign and pitch black confined space?
How is car exhaust, straight from the tail pipe, anything like the CO that leaks into living spaces from heating systems or gets loose in an industrial settings? There are no parallels. Cars expel hot exhaust that happens to have CO in it. NOT comfortable pure breathing air that happens to have CO in it. This method would be no more peaceful than holding its head down a stove pipe.
My two cents.
Furthermore, just get it done. Its terrible and we all feel bad when it has to happen, but it needs to be done and finished as quickly as possible. Just go the hatchet route or break the neck IF YOU KNOW HOW TO EFFECTIVELY DO IT and move on. You owe it to both the animal and yourself. Constructing elaborate death machines is not going to work as you wish or make this peaceful for anyone.