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Truly a rarity, cards like this need to be written up in magazines as how they were found would be of more interest to me than some kid who opened a pack and found a cool card.
I've seen those cards before, the General Baking cards - very rare cards, don't come up to auction very often and that card listed was beautiful! Wow, at a PSA 2, it was a great looking card.
D304's are attractive little bread cards. There are a few different types of backs too, so the value is based on the back as well like other sets of its Era (ie T206)
The value is based more on attractiveness than over rarity. They are scarce but not impossible to locate. Even commons will set you back good $$ now (set collectors). D304's have gone up in value about 1000% in last 10 years as a group.