Got some Titebond as suggested. Haven't used it yet. Only thing I'm doing is gluing them together so I can push and pull them at the same time without one of them falling on the floor. Nothing more than 4 or so boxes of cigars going on any of them so I'm not concerned about the "strength" of the joint. And I've got 1 1/2 inch holes cut out of them so I have plenty of air flow.
I don't have a biscuit cutter but I did eat some biscuits for breakfast Sunday.
Thanks for all the advice guys.