Ah, you were smarter/more patient than I was-- most toy boxes immediately got mangled and destroyed in my eagerness to get the toys out of them. Which is why 99.9% of my things are worth nothing now. ;P
Although there is some COOL package info out there-- Star Wars and Marvel Comics figures were always my favorite. When I was really young, I could buy any action figures I wanted but my parents were a little leery about me reading any 90s ultra-violent comic I wanted (yeah, probably rightly so) so I learned about canon storylines via the "stories" on the boxes. Sigh... good times.