Ive seen several wild caught BP's back in the early 90's that were around 6/6.5' feet but nothing bigger. I bought one myself but traded it assp for a CB Boa because i was just a kid and it was loaded with Ticks & Mites.
I also know of some big Balls that people try and call another name (cant think of it off hand) but all they really are, are wild caught older Ball Pythons that continue to grow throughout there life. Ive seen Bids on these Notmal balls that are 6.5 feet for big money... I guess some people are stuck on "bigger is better" but they might be buying a 25 year old snake for all they know.