Theory: A simple barrier which only boxes can collide with to prevent loss of possible valuables. (Red boxes+Water/Lava=Depressed.)
Map(s) 11, 17, 86, 94, 121, 126, 142, 153, 161, 172, 215 All have a high possibility of a box being thrown into the lava/water etc... I feel that players would benefit from having an invisible barrier that only boxes can collide with, simply as if it hits a normal wall, it will bounce off it.
I hope people will consider this as a good idea as it's not nice to lose 3/4's of your boxes to the scenery.