During the ordering process for my FP4 recently, I inadvertently ordered the protective case for the FP3. So I’m looking
- for an FP4 case that I can have
- to give away this FP3 case that I can’t use
Ideally, I’d find somebody looking to swap, but that seems unlikely. 
Given that the FP4 is a bit bigger than the FP3 and that FP3 cases have been known to expand to the point of no longer safely containing a FP3, perhaps there is an upcycling opportunity to be tried… 
(My replacement FP3 case is starting to loosen now. I would post in the original topic, but it is closed…)