The lost girls of northern Nigeria are unfound. The problem is unrealizable aspirations.

The 276 teenage girls kidnapped in Moslem northern Nigeria are still missing.

The problem is the 4 wife standard. Nature has provided that half of births are men and half are women.  So if men try to change the1:1 rule to a 4:1 rule, then it is inevitable there be, (1.) periodic mass abductions of wife material, and/or (2.) large reductions in the potential husband stock.  Both things appear to be happening in northern Nigeria.