Seriously, where did you get that semi truck? I would take it out and play with it, not keep it in a box.....
An eBay grab back in late '03, if I remember right. It was the first one "found" in the hobby, as I recall. At last count, there are six (6) others known. It's still sealed in its original packaging and sealed in the cereal box case for display. I'm thinking of putting it in a volcano, like the Juicedratic equation...lol.
And, to really answer your original question, I have my keeper sticker sets in binders/pages like you. I know some think this unsafe (and maybe it is), but I like having them accessible and easy to view. All my spares/extras are in cardboard card holders, like I showed my extra puzzle pieces on another thread.
And also, thanks to all who've complimented the display, I appreciate that you appreciate it. As long as someone asks, I'll post pics.