Why does bud check to make sure nothing is missing from his suitcase

Bud checked to make sure that everything was in his suitcase because he knew someone had been looking through its contents.

I could tell right away that someone had been fumbling through my things. First off, whenever I put the blanket in, I always fold it so that it stops all the other things from banging up against each other, but those doggone Amoses had just stuffed it in without paying no mind to what it was mashing up against.