The article says the material is undetectable by dogs and serurity devices, can be made to resemble a chocholate bar or molded into any other shape. Maybe it looks like a block of cream-colored clay, something a kid would model with, and packed in a retail package.
If it's so tough to detect, makes me wonder why they used the real thing instead of an inert substance that has similar appearance and other physical properties.
Silly Putty comes to mind...