Here's a recap from an alum that was one of the organizers of this classic prank. The link is identical to the account that appeared in the 1999 yearbook.
http://people.bu.edu/fmri/somers/cannon.html
In the Spring of 2005 a group organized the CalTechEmbassyPrank in another attempt to steal the cannon.
On 28 March 2006 we received the following email from DeanChris:
Howdy,
Did anyone steal the Caltech cannon Monday night/Tuesday? morning? They called and said it was stolen and were hoping it was here.
Chris
Turns out Mudd really wasn't responsible: http://howeandser.com/ or http://web.mit.edu/jotong/Public/Photos/MIT/Caltech%20Cannon%20Hack/