Ah... the old "re-sealed box" trick, eh? Yeah, I suppose that's certainly a possible way to detect the Indys, though still an unethical one.
Dale, you could probably still toss Indy and his accessories on a sensitive scale, and do the same with Han and his gun, and see if there's much of a difference. I don't really see the need to weigh the Han boxes before they're opened, since the weight difference would be in the figure and accessories - assuming the same box, foil wrap, and clear plastic bag comes with both (except the sporadic quantity of glue possibly).
I'm not sure if our mail scale here in the office is sensitive enough (doubtful), but I'll give them both a weigh next week when Indy arrives. Scott/Mr. Engineer - do you have any ultra sensitive scales around your work?
Interesting tip there Scott... Give it a shot Simon! Let us know if that's the legitimate method of Indy discovery. Good luck to ya'...
EDIT: Didn't catch Dale's reply. Maybe not then...