Just thought I would chime in as well a bit.
While you could eventually do just what you are talking about with the truffles in the NW boxes-Kristin is right, it is not going to help her actual practical truffle hunting skills if the issue is the environment. It does work her competition NW brain which is good, and solidify alerts/ build a history of confidence and experience but for actual truffle hunting it doesn’t add practical application value.
When you start burying hides the intensity level of the ‘game’ goes up dramatically. Keep it very simple and in a small area to start. Only gradually once she has it down pretty solidly, increase the area.