Antoine Walker also wore #88 for the Celtics for a couple of games in 2005 after they re-acquired him but pictures of that seem to be scarce as he changed back to #8 that same season.
We'll have to get creative again, the next jersey number that someone has actually worn is #84. Once again, the perils of starting the countdown this early.
October 6th has been confirmed by the official site and conveniently, it includes a countdown. Our photo countdown still won't be particularly easy until we hit the mid 50s, but there's still a few in between so we'll do our best.