William H Bonney
Registered User
In Buffalo it was reported he wasn't asked. *shrug* The team had hopes that he would go, particularly a comment from Botterill back at the trade deadline that indicate Jason thought Mitts was going as part of his explanation why he didn't paper-transaction Casey to the AHL like he did Thompson when it was clear both need a lot of work on their NHL-level game.
It was this tweet that I found about Mittelstadt after the season. It's not declarative in that he was offered or not. It's quite possible Mittelstadt hadn't been offered yet and stated he wasn't playing so he was never offered.