If the cards were only inserted as a sheet within a magazine, it's OK to upload a couple images of the pages showing the cards to the Packaging section to give an example of how they were distributed. I did that for Nintendo Power cards that were included six per issue, and Admin accepted the images with no problem, so that's OK. That being said, showing all 12 monthly magazines for each SI for Kids series is overkill.
And obviously it's OK to upload food packaging if it shows a specially-marked card/sticker promotion.
The Publications section of the site is to show price guides, either yearly or monthly.
* Ed * L8 * Cards in my personal Collection are unavailable *