In fact, we've already handled this one properly.
If you go into the "set" and look towards the top of the page, you'll notice that the sets, no matter which parent set you come in from, brings you to the "1987 Donruss Highlights" page for the mini-puzzle card. Since it is the identical card found in 3 different products, we have set it up so that when it gets added to a member's collection, it's only using 1 card in the system, just accessible from the 3 different releases.
(For the more technical, this is a function now available in the IR section called "cross-linking", and if you want to know more about how things need to be set up for this to occur, PM me. I know not everyone will want to know this level of detail, so I won't fill this post with those details.)
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).