I'm suddenly intrigued by all this speculation about the Treasure Hunt boxes.
I'm remembering two things in particular. (Well, three if you could the brightly colored leotard/miniskirt combos the models wore...) Over and over, and many years after the fact, we've heard stories from Chuckie Baby and from Geoff himself about having to be ready for dozens and dozens of possible skits. Certainly Barris has a reputation for making stuff up, but if that's something that's NOT true, it's a legend that has survived without any real evidence to the contrary.
I'd also wonder how S&P would figure into all of this. If there were fewer skits than boxes, and only, say, half a dozen prize packages, as long as S&P knew about it, would it matter that the audience is being led to believe that there was something different in every box?
The other thing I always remember is that at the end of the skit, Geoff would show us the empty box, proving that there was nothing left inside. I always thought that was a little silly since there was a commercial break between the contestant's selection and the reveal, time enough to put in or take out whatever they wanted.