ps Im presuming they are both neutered (not vasectomized) when I said about trying them together , as if either isnt 'fixed' they may damage each other being the breeding season. Theyll probably grapple for dominance in any case which is normal. I had ten ferrets (mixed sexes)running together in my younger days , all neutered , and in an aviary space, so I suppose when we added various ones they had plenty of space and distractions. Always found rustley bags and old jumpers served well to amuse them though on introduction. Good luck Paul. (Perhaps you have a neutral space where you could introduce)
Both of these are entire (not neutered) I tried them together in a neutral Place this morning and they got on great, little bit of grappling here and there nothing major though. Just a bit of ferret play. They are both currently in the same hutch and seem to be getting on fine. Will keep an eye on them and if the owner doesn't come forward I'll keep him.
Used to have 13 ferrets at one point all in a huge enclosure, it was mental, again just the usual ferret pet rough housing but ferrets are tough little buggers.