Well you actully have to explore alittle i dont own the games but when i saw my freinds play it they found them one was underwater and one was somewhere else i dont remeber where exactly
Maybe you were mistaking a corpse that wears a full HEV outfit for Colette Green, Colette's suit is maroon, but if you're not paying attention to color, you could possibly mistake the corpse for her (even though it has a helmet)
and one was somewhere else i dont remeber where exactly
By "one", you mean Gina Cross? Or a corpse that may be Colette's or a full HEV suit scientist?