Hmmm, very good question...
My (our brother's) Wii, gamecube games and controllers set. We spent years building up those games from the early 2000s to the late 2010s. So many accomplishments, unlocked content, and experiences. Won't say how we lost all that, but, I can't believe how on Earth somebody would do something like that to possessions that aren't even theirs, let alone electronics...