This is number 13, it’s a screenshot from a Skybound Blind Box unboxing youtube video. That means there are 12 more out there. I’d expect there to be at least one Negan sketch. The others, more Zombies?
And has the Blank cover been confirmed as a Here’s Negan one? I’ve seen just the one picture on GoCollect (where I think the picture in this thread comes from). While it is not impossible some blanks escaped the printer’s (it happened before, right), it is perhaps more likely GoCollect snagged a picture of a blank from the other series for lack of a Walking Dead sketch.