The ones that were on the air under the previous Pax TV branding have the *PX* calls. The calls were never changed since they don't brand around the local station calls.
Scripps does not seem big on changing calls letters. The former Ion affiliates signed up as local NHL flagships that run as independents retain their old calls -- KMCC Las Vegas, KUPX Salt Lake City, WXPX Tampa -- as they are branded on air without the calls (i.e. "Vegas 34," "Utah 16," "The Sport - Tampa Bay 66").