I am trying to make a shot of a robot looking into a baul baul with the robot and the baul baul being in CG. The scene is lit with an hdri and I have the robot framed into the baul baul but I am having a hard time getting the robot to have a shadow within the reflection. I have put a plane underneath the robot and I can see the shadow there but I dont want to see the plane so. I then turned the plane into a shadow catcher material and used a RS object tag to make the plane hide from primary rays but then the shadows go with it.

Any ideas welcome:)