I have the 9998 ransom bill list in a searchable spreadsheet. It was a lot of work.
Every few months or so I check $20 bills listed on EBAY, people mocked me for it, screw em, I have also selected interesting/collectable bill SN's from the list and googled them.. Funny, I got a perfect SN match, but it was a $1 bill, I never thought they would use the same serial number for different denominations. I have found some $20 bills that were very very close but no matches. There are no start/stop bills in the list and I have identified around 80 TBAR bills, they are distributed fairly random in the list. That is because the FBI list was re-ordered from the random sequence given to Cooper to alpha numeric. Unfortunately, we don't have that original order.