On the morning of the new year, we found this note in the hallway outside Alice's door when we got up.
The note, transcribed and edited for clarity, reads as follows:
For Alice: Alice have you been looking for pink poof? Well, I stole it and you'll never find it. I found it in the box and I have it. Your egg is lost. Anyway, it's stupid.
So Simon is in full form as annoying younger brother, it seems.