First player gets close to 'box',
If(vec_dist(my.x, your.x < 40;//if player comes as close as 40 quants
box.x = player.x +20;//offset 20 quants in front of player
box.y = player.y;
box.z = player.z + 2;//offset a bit upwards (from origin of model)
my.frame = your.frame;/when player moves, the 'box' moves too in the same frame
my.next_frame = your. next_frame;//when player moves in the next frame, 'box' moves with it.

The BOX that was on the ground must be deleted as soon as the pick up is made.

Hope thios helps....