They uploaded short video with a comment:
"We do not plan to spoil the entire game. Neo Plus magazine collaborates with games publishers and respect their embargos. Enjoy the taste, however - it REALLY is RE6 and it REALLY works"
Considering the tone of the last two comments I can understand him a bit, although he did voice his opinion rather poorly.
But regardless, from the comments I've read so far from various polish gaming websites, the store where they bought it wasn't one of the bigger retailers (MediaMarkt, Saturn, Tesco, Empik, etc.), but a small videogame shop, a mom and pop video game stores as some might call it. They had 7 copies, all packaged the same way and all sold in a matter of hours. Word is there's also another small store in Warsaw expecting a batch of RE6 copies in the next couple days, unconfirmed for now though.
To me it sure looks like somebody got a hold of stolen discs, most likely from a packaging plant, and is now trying to make a quick buck by selling them to smaller outlets.
Back when I was at Orbital, we noticed that Racing Gears and Metroid (Fusion, I think?) were up for "download" 7 weeks before the release date. Sadly the leaks at manufacturing and distribution are legit.
It actually makes me wonder why Capcom went gold so soon and shipped it. Best strategy is always to ship it at least a week before the street date, just to avoid even more piracy. This is like a happy meal for them. 1 freaking month before the official release.