you didn't post a BBI thread first asking to how to get out.
The envelope slot to send his notes he would have had more room to write messages and may have escaped earlier
He should have messed with some of the customers by sending notes like " "you have negative 100,000 in your checking account" or "You smell"
about a decade ago I was a regional manager for BAC. One of the branches I managed had quite the reputation as pranksters. One of the pranks they would pull regularly is entering into the ATM service room with a microphone and small speaker, then watching as customers approached. They would speak to them in an "ATM voice" through the mic, and they would personalize their comments to the customers they recognized. Funny stuff.
Of course this wasn't even close to their best office prank, which I personally orchestrated and enjoyed very much. Come to think of it - office pranks - might be a topic for an NFT thread. I'm leaving on vacation and do not expect to be on BBI much, wonder if I'll miss an epic thread.