It seems that the same guy acquired ~ 1/10 of all NNN.in combinations . Is there demand for NNN.in domains? In this forum it is a long time passed since someone offered NNN.in domains. On sedo there are listed most of NNN combinations. Some of them have offers. 396 already have offer. Numeric domains have not so many meanings as LLL, but if you take 100 domains, I think there is probability that some of them will receive offers and redeem all investment.
I have made full scan of NNN.in availability, there are no available now.