Oh man, I love telling people to dig up their old collections.
Unfortunately Fallen Empires wasn't a very lucrative set financially (though if it's in good condition, you might be able to find an eager collector for the full set) but if you have others, you can check out prices here -
https://www.mtggoldfish.com/prices/paper/standard

If I had also played since being introduced in the late 90s, I would've had a very different asset collection right now...