Draft post was written back in January, probably, and the files in /03 were only added recently. Wordpress can split uploaded files into this folder structure automatically based on upload time.
But that's the bit I find strange. The datestamps in the images would suggest that the conversation took place recently (march). The wordpress splitting suggests this is not the case.
Well noticed! I wasn't able to look at the images earlier (at work), but at least this image http://bankofamericasuck.com/wp-content/uploads/2011/01/boa1... is interesting - the email is timed March 11, but it's in the January folder. Wordpress doesn't let you upload new versions of the same image, so it can't be that...
Which makes it look like a pre-scheduled hoax?