Yes they were just dropped on the ground in their millions !
I remember back in the sixties and seventies kids tv programmes Blue Peter, used to do charity fund raising events each year, one year it'd be ring pulls, another year, used postage stamps and another the foil milk bottle tops, when milk was delivered to our doorsteps in pint glass bottles, which of course we washed when empty and put them out for the milkman to pick up the next morning.
Often if you weren't quick enough getting your milk delivery in, you'd find birds had come and pecked through the foil to get at the cream on top !