[nittany13]

Pinnacle Totally Certified Platinum Kerry Collins: parallels exist for all three Red, Blue and Gold versions of that card, although I do not have any to show. <br />
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There is also at least one sample from the 2002 Score Changing Stripes insert set:<br />

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The Totally Platinum XXXX/30, 2499, and 4999 exist for all cards in the set. Extremely rare!<br />
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As for Donruss/Playoff owned cards from 1999-2004ish, there are just TOOOOOO many cards that are LEAKING out with "no serial numbering" and "various font types of SAMPLE". They are great to chase, but Beckett would never be able to catalogue all of them.

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I always had a hunch that samples existed for all three versions of every card in the 1997 Pinnacle Totally Certified Platinum cards, but was never certain. BTW I hope you didn't mind me using one of your pictures as an example (I did not figure that out until later). <br />
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As far as your second point is concerned, maybe simply there are not very many samples leaking out of the players that I collect but I just have not found too many examples of this.<br />
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There are those who will disagree with me but I do not categorize a card with a missing serial number, when its supposed to have one, as a promo/preview/sample. I classify that type of card as a "defect" in fact, hence those examples I agree should not be listed. Personally I do not even bother to collect those. The same thing goes for variations of cards (prototypes) that ended up on the factory "cutting room floor", if you catch my drift.<br />
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However if a card states promo/preview/sample or XXX as in the most previous example then I do believe in that case the card should be listed. Unfortunately I also think it would be difficult to classify in many instances which promotional cards "appeared" only after the company went belly-up (as I briefly touched upon in a previous post).