I have a few parametric projects I posed on my github:
https://github.com/profdc9/FreeCADParametricModels
One of them is called "Memorybox" and is a gift box I made that has parametrically definable dimensions, and the text embossed on it can be changed as well.
Place your phone in a sealed bag with a container of anhydrous calcium chloride, like Damp Rid. DO NOT allow the powder to get in the phone, just have in the same bag as the phone. It is a strong desiccator.