How can you know where something is if it is lost?

Although you may have lost your keys, you may very well be able to know for sure they're somewhere inside your apartment.

Unless someone took them from your appartment without you knowing? Which is unfortunate for keys but kinda bad for armaments I suppose.

I think the implication here is that someone who is not part of the planned custody chain has it, but that someone is still within your organization, and under your control.

Paperwork. Miscounting. Bent Spear also covers, imho, incidents where a device is counted twice, where it is on two different inventories. In such a situation there is no suggestion that the device is gone, but at least one of the two lists is inaccurate and therefore 'missing' a device.

That makes sense. Thanks for clarifying.