sam2, perhaps neither can be considered a shliach, one needs to be holding the get to be believed as a shliach, and both of their strongholds are questionable and incomplete, perhaps similar to shnayim adukin bshtar. So, actually, neither are bchezkas shliach, to assume that their bfan”n is that of a shliach. One needs to be a shliach to have that neemanus. Kein nireh.
I think it is a good get because each are b’chezkas eid kasher, therefore, regardless of their being a shliach they are believed as two eidim (unless of course they are krovim or nashim). I don’t think the sugya of shtei kitei eidim is applicable.