There are real issues such as "the grey market" where cameras are imported and you end up with no warranty. That's not a Samsung issue but as we move on we all hope the days of warranty issues across borders to improve.

WHY THIS IS takes a short course in how the world legal systems work and much more. But the grey market items could explain why the s/n is no good.

But let's get back to this "RECENTLY BOUGHT." Most stores will swap out or accept returns if the product is dead or bad right out of the box.
Bob