I had got some old firehose from the local volunteer fire department to make some kind of protector for the collars but put the hose in the shop and totally forgot about it until now.
I ordered some of these because the rubber antenna holder and GPS wire protector on my older collars are in bad shape and falling apart.... but I'm going to look for that firehose and see if I can add some protection to the box too.
https://suwanneedogsupply.com/products/knot-normal-collar-protector