Virtually ALL Casascius coins would show up as 'unavailable'
The first one I bought would show its not moved in2 or so years.
Yes that's exactly what I want to know. If it haven't moved in 2 years, it's likely it will not move very often and can be counted as out of circulation, I want to get an idea how many Bitcoins are circulating on a daily basis.
I sold a casciius Bitcoin to a friend this year. It hasn't "moved" on the blockchain since 2011. I would imagine MtGox cold wallet hasn't moved for years either despite having tens of thousands a Bitcoins a day in trading volume.