Lost old Age of Empires 2 disc 1

I recently found my old box with Age of Empires 2: Gold Edition and had the itch to play it. However, I can’t find disc one for it. I was tedious back then and looks like I wrote down a code in the book that came with it (i would presume some activation code or something?) and i still have the certificate of authenticity seal on the box. Is there any way to play the game without the original disc 1?

If only you can get an ISO of Disc 1 from somebody and virtual mount it.