I'd save those heads as they are in the packet.
Like that they have some real collector value.
Bear heads are not exactly hard to find,,,bear heads still in the pack are.
It's not the same as never driving an old corvette ect,,,,their out of the packet already,an I bet you can't find one with zero "genuine" miles on the clock,,,and if you could I'd also bet the ownner would shoot you before letting you drive it.
From a both a dollar and a collector value,these heads still in the pack do have some value,,,out of the pack their just another bear razor,of which there are millions spread all around the world.
So why ruin something of real collector value by opening the pack when theres absolutely no need to.