Y'know, it's a long shot, but seeing as you've tried all the ways I would have recommended... I reckon trying to contact Sheeds would work. I'd almost guarantee he has a video library of every game he coached, or know someone who does.
Email [email protected] and ask them to pass your request onto Sheeds. I'm sure they would have an email account for him there - seeing as he's on the board.
Other than that, if channel 7 can't help - I'd have no idea.
Check out YouTube mate, there are full replays of old games on there. Last night I watched Round 9, 1993 Essendon v Adelaide at the MCG. Derek Kickett kicked 3 goals in 2 mins in the 2nd term, Hird and Wanganeen (must've got the 3 votes) starring as well. What memories!