Big thanks to AdditiveTechSolutions for the start on the idea! I put the original mesh in Fusion 360 and added the hole to get the money out. Lost some polygons there. Then I sketched up a simple plug with a wide base. The plug needs to be made in a flexible filament. Now you can get the money out and protect the counter it sits on. There are two sizes. The original was 128mm tall and the larger which is 200mm tall. The larger is more suited to put larger coins and folded bill inside.
Polyalchemy, Inland PLA, TPU
I used tree and standard supports for the elephant. It takes some time to pull them from the hollow center. The plug should have no more than 40% infill to be soft enough to push in and remove.