I think those stopper-thing are meant for adding weight...
You see, trading figures are sealed inside boxes so that the only way that you'd know which one is in a particular box is to open up the seal after you've paid for it... And if you happened to get duplicates, you can trading them with someone else, hence the name 'trading figures'...
However, as some figures may be lighter or heavier than the others, mostly due to the design eg. long-hair's usually heavier than short-hair or armor's usually heavier than s... (
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