As a category, (???1)Pos(-1)\Pos is a monoidal category in a unique way, and a category enriched over this should be (at least up to equivalence) a 00-poset, which is a truth value; and indeed, a category enriched over (???1)Pos(-1)\Pos is a category in which any two objects are isomorphic in a unique way, which is equivalent to a truth value.