Actually, technically speaking all 3DS systems are originally region free, then they have the region's FW put on them, so there's a small chance it's a console that hasn't had the OFW put onto it yet, it's once you put that on the system the region lock happens, easier to mass produce if the only change they need to do is install a different OS in each one after all instead of tweak hardwares and that's also why you can change regions that easily with CFW by simply changing the OFW. SOME of these WERE once actually sold back when the 3DS first came out.
Although 99% it's just either a fake and it's just a normal 3DS with lies on the store page or just CFWed to work as if it was region free.