Just looking at pkglocatedb, I've found at least 4 distinct copies of these.
As far as I understand, the DejaVu stuff in base X11 is an extended version of the same fonts with more international characters. So, the question is, how hard is it to just link DejaVu to the extra Vera incomplete files ? or is there some extra magic to get DejaVu to act as Vera fonts ? or is there an actual good reason to keep those extra files ?