Groetchen Twenty One extra coin tray

[Gaz83519]

Hello from not so sunny England!
I'm just in the process of restoring a Groetchen Twenty One trade stimulator, it is on the old English big penny, and it has an extra cash box underneath.
Does anyone know if this was a period extra, or just what somebody has made up? It seems to be of the same sort of age & made of the same type of wood.
The reason I ask is the rear top panel of my machine has been damaged where someone has forced the door, and the side of the extra coin box will make a good replacement, but obviously I don't want to go chopping it up if it's an original extra.
I'm also after the little door that goes over the gumball chute if anyone has one.

Thanks, Gary.