I had a similar issue as the OP when I bought my Garmin 520 - opened the box in anticipation to see the gap where the head unit should be - all the other gubbins were there.
Contacted CRC who asked for photos of the empty box (?? !! Oh well) Duly obliged and then after speaking to one of their team they then sent out a new boxed unit.
Clearly a light fingered employee taking kit from unsealed boxes in the warehouse.
Contacted CRC who asked for photos of the empty box (?? !! Oh well) Duly obliged and then after speaking to one of their team they then sent out a new boxed unit.
Clearly a light fingered employee taking kit from unsealed boxes in the warehouse.