ok cool--that will ensure that the cupcake holder arrives intact/uncrushed--the cake can wiggle down the sucker stick if the box is upturned--or lands on it's side--
i mailed a tea ring last year and i made sure that there was enough stuffing to hold everything even if it was upturned--
it sounds like you have enough for everything except for upturned--you might need a cardboard 'o' ring to sit on top of each one to keep it in place --y'know like if you were making a paper garland for a christmas tree--something to keep it secured in one place
do you remember pizza hut used to place a little plasticc dooey in the middle of the pizza boxes to keep the box lid from sticking to the cheese? you need a mini sps to set upside down on top of the cupcakes to hold them in place to ensure safe arrival
sorry if i'm being too detailed but when you get different food items delivered to you note how impeccably skillful they ship them--nothing left to chance
hope all goes well!