1993 collectors edition sealed box
Here, it's sold for $3,800.00. I'm guessing yours will fetch a few hundred less (they are retail and try to sell for profit after all).

Things to know. Don't open them. The value is on being sealed. They all contain a full set of cards, so there is no chance of getting card X or Y, there is no gamble, they are all there. That means you also have 1 ultra rare "Black Lotus" in there, but here is the catch, all those cards have gold trims in the back, and square corners. This makes them possible to distinguish from "regular" magic cards. They can't be played with on tournaments (for example) and the black lotus is worth far less ($400.00) than the "real" one ($125,000.00)..

I'd sell them on eBay, although if you don't have a good seller's reputation, it'll be a hard sell.