You folks are better plant Moms than me. I could never hold them like that for weeks without potting up. I'd forget about them, or be negligent at watering, and they'd dry out and die. Last year I planted them in yogurt cups and held them like that for a couple of weeks until I could plant them outside.
But, I only ordered 10 or 12 plants, a little more do-able than 4 boxes...
Karen