I’m looking at mine and wondering hownahell did someone manage to do that? Gouge it with a knife-point and pry it out? Like, whut??

I doubt anyone’d sell the individual cover, but you might fab one out of a generic silicone switch-boot, maybe stoopit-gloo it to the switch-button caaarefully.

Doubt it’d be very watertight afterwards, but it’ll still work. Just don’t drownd it.