Always fun to play this stuff, but I have to agree with SamIAm, sell anything you want to open for 5X what it is worth unsealed, buy the unsealed version and PLAY IT! Then, take the money you made and buy more TG16 stuff! I always sell to buy more, not to make money, and it is more fun buying stuff with "free money"! Super Congrats on an awesome find!
What to do with this collection is a personal decision.
From a purely financial standpoint, keeping the games sealed would make the most sense and either selling them now,when the market seems pretty hot or waiting to see what happens over the next few years... keeping in mind that the price may go up, may go down, or may even crash. If you really want to play them, you can find cheaper open games, while making a profit selling them.
For some people, it would be worth the money just to open Magical Chase... a pleasure that will likely cost you several hundred to a couple thousand dollars.
For others, just knowing that they are one of the few ppl to have a sealed Magical Chase is worth it.
For some, getting the money would be nice... essentially, you can flip some plastic, silicon, and cardboard into a few thousand dollars... not bad...
Others just want to play the game... MC is not terribly easy to find in general, so opening the box is one way to do it... of course, there are other more economical ways to play the games: e.g., emulators and flash carts like neoflash...