Quote Originally Posted by iCake View Post
Short [o] in box is how Brits pronounce them. Americans go with a strong [a:] or a strong [o:] as far as I know.

Compare American pronunciation with British one here
Listen to "box" pronunciation here at the most famous American dictionary
And here
there are some regional variations. Seems there is a "Great lakes vowel shift" happening. Things like "block' are sounding more like 'black'!. Chicago etc.