The Case of the Missing Advent Calendar Chocolates

In celebration of the season, both Sophia and Harrison were bought Advent calendars to count down the days until Christmas. They even got to pick which design they wanted. Sophia picked out a snowman motif, while Harrison chose the Santa at the Christmas Tree design. Each and everyday, they both get to open the one door on their calendar that corresponds to whatever day it is, and get a surprise by what shape the chocolate is, then they get to enjoy the treat. Yesterday, I walked into the den to find Harrison sitting on the floor with Sophia's Advent calendar. At first glance, the calendar was fine, just on the floor. Upon closer inspection, I found that the doors had been opened and the chocolates removed. The doors were then pushed back closed. "What did you do?", I asked. "Did you eat your sister's chocolates. Did you open all the doors on her calendar?". "No", he replied. "Then where are the chocolates?", I asked. He replied by pointing to his stomach. Apparently the chocolates mysteriously vanished from Sophia's calendar, and reappeared in Harrison's stomach. Spooky.