https://www.youtube.com/watch?v=PzkymX2TxHE
This video has a local Rochester, NY bumper (around the 12:00 mark). There's also an ad for the Battle Nexus 2 on GBA. I'm sure there were other local station bumpers, similar to how the OT had local promos for the show. I suggest looking for "Sold as blanks" lots of blank VHS tapes online or at yard sales- who knows what will turn up. Unfortunately, I wasn't into TMNT at the time, though I do have a few VHS tapes of Adult Swim from around 2003 or so.