At the game they simply told us that it was Dan Carpenter's long for his career. They made no mention of it being the longest in team history.
Of course it was. But why the lack of acknowledgement? I think its because there's an error in the electronic version of the media guide - I just got a copy of it yesterday, and went to look it up....and that page is missing! In the print version, its there. But assuming the problem is consistent in all copies, that would explain it.
The previous long was 59 by Pete Stoyonovich against the Jets two decades ago.