Easiest way to tell if the game was restored by us is by looking at the silk screened warning text on the back of the cabinet. If it was restored by us, it will have either a Hot Rodded Pins logo or the very early Pinball Tales logo. From memory only three or so games had the PT logo before I changed it to thr HRP style.

No silkscreen on mine, Pinbot doesn't have one.
All I've got is Tim's lousy signature on the manual envelope and free play card 
Those were the days...