Term for when inventory is discovered to be missing

I previously worked in a bookstore and at around this time of the year, we did an inventory of the bookstore, counting our stock and shipping back old stock to corporate. There was a term we used to describe what happened when there was a difference between our computer stock read as and what we actually had on-hand in the store. This term essentially meant "unanticipated loss of stock due either to theft, misplacement, or other reasons." What was this word?

In similar environments the word I've heard used is

Shrinkage

http://en.wikipedia.org/wiki/Shrinkage_(accounting)

I've heard the term inventory discrepancy used for similar situations.