Not shifting lever is moving and runs great just isn't engaging

What is your question?

Bought a car at auction and before the sale the employees test each vehicle so the this one was marked good. Now there e is a certain group that goes to the viewings so they can disable and get them at a better price. So I know the vehicle ran and moved good before the viewing but now it isn't shifting. What could have been disabled in order to cause these symptoms in this vehicle

What makes this problem better or worse?

Nothing

How long has your 2006 Mercury Mountaineer had this problem?

One day