For those that commented that warranties do not typically travel with the unit, some stores (both items were being offered by brick and mortar stores) offer a warranty. I bought a number of used Pass units from Reno Hifi (may they rest in peace) and each one came with a warranty.
But this has nothing to do with the issue at hand. A seller that posts items and then ignores correspondence should not be met with excuses. And law suits? Come on. A bad review after a purchase is not immune from those either.