The bureaucracy of death is so broken in Iraq that nobody's figures have any real credibility. There may be a legal requirement that death certificates be issued, but it's probably ignored more often than not.

If a Suni Iraqi is shot dead, it makes far more sense for the family to have a guiet, unannounced, undocumented funeral than to turn the body over to a morgue and risk having other family members killed when they come to claim the body.