As four other top level comments say, that's not a lot. In the US it would be unthinkable to track inventory to that level of detail, and one person could plaus

As four other top level comments say, that's not a lot. In the US it would be unthinkable to track inventory to that level of detail, and one person could plausibly own the whole lot. Anyone ask how many pencils the US Department of Education is missing over that period? I'd add that with a group of 100 people, you could buy this much ammunition in a week without raising eyebrows. Much more if you can travel across the border to Switzerland. Or you could have pocketed one round per person per week over the ten year period the report refers to.