Boxing day because in canada they box up and return their unwanted gifts .

The exact etymology of the term "boxing" is unclear and there are several competing theories, none of which is definitive.[2] The tradition has long included giving money and other gifts to those who were needy and in service positions. The European tradition has been dated to the Middle Ages, but the exact origin is unknown and there are some claims that it goes back to the late Roman/early Christian era; metal boxes placed outside churches were used to collect special offerings tied to the Feast of Saint Stephen.[3] In the United Kingdom, it certainly became a custom of the nineteenth-century Victorians for tradesmen to collect their "Christmas boxes" or gifts on the day after Christmas in return for good and reliable service throughout the year. [4] Another possibility is that the name derives from an old English tradition: in exchange for ensuring that wealthy landowners' Christmases ran smoothly, their servants were allowed to take the 26th off to visit their families. The employers gave each servant a box containing gifts and bonuses (and sometimes leftover food). In addition, around the 1800s, churches opened their alms boxes (boxes where people place monetary donations) and distributed the contents to the poor.