I have the majority of my drawings from childhood still, they sit in a few plastic drawers near my work station. I personally love looking back through all of my old stuff, especially from pre-middle school which was when I started "seriously" getting into drawing as a hobby, just to remember all the crazy stuff I did xD
Similarly to @Humbug there are a few notable missing things that I wish I could find but seem to either be gone or buried in storage somewhere though- One was a series of comics I made in elementary school about a rabbit named FRED- Funny Rabbit Except Dumb. Was just a grade-school level comedy strip that I'd like to re-live.
The other is a nartuo fan comic I made in middle school, just because A.) I can't remember if it was better or worse than the digimon one from the same era that I still have in my drawers and B.) I remember it being kind of mean because the main plot of the first chapter was a kid I didn't like in school getting assassinated and all of the self-insert MCs having to solve the mystery of whodunnit. While mean, also hilarious and similarly would like to see again xD