Did anyone say it was on a coin or bar for sure? Did anyone say it wasn't spread across more than one coin or bar? 
Not "for sure" but in the interview you recently did with Bryan, when directly asked about escrow, your reply was that you did not want to ruin a hologram on a Casascius product.
You also said you would be willing to move the coins to a viewable address should it come to that.
This is not needed if they are currently in a Casascius product, the windowed bits will allow a search easily.
If you do in fact have 10,000 Bitcoins in Casascius products, you personally account for 1/4 of all the active wealth inside them, as a fellow collector I find this extremely interesting.
People can learn for themselves, my initial posts in Matthews thread start here:
https://bitcointalksearch.org/topic/m.1125563
Part of the interview I am speaking about begins at 20:50 in the podcast quoted below.
DonkDown Radio: Bitcoin Magazine Matt’s 10k BTC bet on Pirateat40 Ponzi, Poker is Skill (it wasn’t just bad luck all these years) & Crazier Mike
http://www.donkdown.com/donkdown-radio-bitcoin-magazine-matt-pirateat40-ponzi-poker-is-skill-it-wasnt-just-bad-luck-all-these-years-crazier-mike/
http://www.donkdown.com/donkdown-radio-bitcoin-magazine-matt-pirateat40-ponzi-poker-is-skill-it-wasnt-just-bad-luck-all-these-years-crazier-mike/