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I wonder how far you could take this concept?

A box that only opens under exactly 8Gs of force? Should be easy with an appropriate sized spring and weight.

A box that only opens in zero gravity? Not sure how you'd accomplish that.

For a box to only open in zero G, you could have weighted pins in all 6 directions, pulled back by very weak springs. In normal gravity, whichever pin(s) are "down" will extend and lock it. It would have to be in very low gravity for enough time for the pins to retract to unlock.

Drop it and it will open in free-fall given enough time for the mechanism to react.

For a bonus challenge it should also require some sort of manual manipulation while it's in free-fall. Then your options are pretty much sky diving, in space, or a parabolic flight path.

Do note that falling at terminal velocity is not free fall.

No, but it's generally close enough for most purposes. Especially for a small object with little wind resistance.

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