Yep. That is the response I would have expected from the PCGS website but nothing was returned back to me. I just checked it again & the site just replies with the same cert verification input page. It's not working for me & it is a puzzlement.
FWIW I've found that the PCGS website replies properly when I use Firefox but it replies with the blank input screen when I use Internet Explorer. It's apparently an IE problem & not a coin problem.
Firefox makes everything work trouble free for me and has for years,get away from the Redmond Mafia if you want to keep your hair from falling out!