where the hell is the PB pet?

Chances are, it was probably inserted for a separate event along with the perma Jr. Reaper and this is not a glitch.

It's not like Cyanne's thread is 100% correctly predicted, because I would guess that Cyanne lumped all of the Event items together assuming they were all for Black Friday.

There's actually a tag on each black friday item that gives it the scrolling sale border (class = 4). Probably what happened was that Nexon tried to remove the two pets from the sale but screwed up somewhere with non-Scania/Bera servers, causing every item after them to glitch up.