it used to be a 12 day tradition , for Christmas.
times change
from putting up the tree and its associated decorations
on Christmas Eve ,
to taking them down on the 12th or 12th + 1 day.
then there was Xmas. decoration up after Thanksgiving disgorged its self.
trees etc , on the curb , or backin the box , on Boxing day or boxing day + 1
times change.
guess that's why its called Boxing Day.