Present Boxes

Present Boxes are anomalous objects similar to the anomalous Egg Boxes that can appear in some personalized copies of Super Mario 64, usually tied to the Internal Clock anomaly. It can reportedly appear during the Winter season, specifically December and Christmas, as well as during the player's Birthday if the game has some way of knowing about the player's birthday.

Description
Present Boxes appear in place of any type of ! Box, resembling a Present Box, most commonly being a red box with green stripes, though other color combinations have been reported such as a purple box with yellow stripes. Present Boxes can also reportedly have a bow on top of them, matching the stripe color on the box.

Present Boxes usually contain the items of the boxes they replaced, such as caps, coins or Power Stars, though can have several unique items depending on the circumstances of their manifestation, such as them appearing for Winter or Christmas having them contain cookies and milk, snowmen, and gingerbread men, and Present Boxes appearing for the player's birthday having party hats, confetti, or cake. These items usually heal the player or function as reskins of blue coins. Notably, in both manifestations of Present Boxes, they can reportedly contain warps to levels such as Chroma Tundra or Delicious Cake.

Theorizing
It is widely believed that Present Boxes were a relatively minor addition to the much larger Internal Clock anomaly due to Present Boxes consistently appearing alongside the Internal Clock, and the association of appearing at certain times to celebrate some holidays. They have also been compared to the type of Easter Egg known as Egg Boxes that function very similarly to Present Boxes by replacing ! Boxes and appearing during a holiday.