Not sure on those wires though... they aren't for speakers thats for sure! Kinda look like wiring for an aftermarket immobiliser, possibly removed by a previous owner...???
All the above comments are deemed an opinion, and in most cases
try a multimeter on that wire see if theres any current comming thu it, but not sure what its for
dosnt look like a speaker wire,
not sure what that box is have you got a better foto of it?
could be, never seen wires like that in a corsa altho it does look like the rear speaker wires in my friends old rover
best bet is like i said get a multimeter up to it, or try tracing it back see where it goes
as for the box it could be alot of things most likely its some thing for ice prehaps a aux output or somthing
having a closer look at the pic it looks like it has writing on it, try seeing what it says even if its just a model number try to get it cn do a search for it
stumped with that pal, would help if i could actualy look myself tho
delete the hijackers! 
