These LEGO Employee Zombie minifigures are super rare! Per Community Manager Kevin Hinkle on Flickr:
These exclusive LEGO Minifigures were given to participants of the 2015 LEGO Brand Retail Manager’s Conference in Houston, Texas; USA. The theme of the conference was “Apocalypse” bringing forth humorous references to zombies and the world after people on PowerPoint slides, name tags, paperwork and giveaways. Each attendee, all employed by the LEGO Group, were given one Minifigure with both a male and female head option in order to customize to their gender of preference.
Here is the packaging they came in. 