Any cereal would be a good, although vey expensive, soil amendment. There are tons of other materials that would be better and cheaper. Knowing how quickly most cereals get soggy when exposed to moisure I would have serious doubts about any of them working as a deterent to slugs and snails, but I'll ask my correspondents in Germany if that is true.

My correspondents in Germany tell me someone is pulling your leg.

umm... maybe it's actually a mini kitchen? hah

Perhaps the box of cereal was shipped by mistake. Being minature, it would be hard to see...

Original poster here...actually I had emailed the company (miniatures.com) thinking they had made a mistake and perhaps they had meant to include a bag of "Miracle Gro" or something like that. They emailed me back that they checked their other inventory and all of their other potting tables also included boxes of Rice Krispies so they contacted Reutter Porzellan (a respected German manufacturer of miniatures) and they gave the info about the fertilizer and snail repellant.
That info is now listed on the miniatures.com website in the description of the "Master Gardener's Potting Table" item #17410. Anyway I think the potting table is pretty cute and I'm leaving the Rice Krispies as a conversation piece!