Think about it from his perspective. He's traveling a lot. He doesn't visit the forums (except for the early days when Ian pointed him in the right direction and subsequently down the path that led us to the 9 episodes last year) so he doesn't know how badly fans are bleating on about this.
He does go online and post about it sometimes - a few weeks back he mentioned on Facebook that he was pretty hopeful that he'd be able to recover a second print of the Morecambe and Wise episode that was found, but was too far gone to be salvaged - so I'd suspect he's aware of how frenzied the Doctor Who-related speculation is, which is probably why he doesn't say anything about Who-related leads (but sometimes does about other things).