I work on campus at my university. Earlier this month, my boss sent me and my colleagues an email, asking if we are willing to continue working during the fall semester. He said that the deadline to let him know about our decision is in mid August, and if we don't respond or decide to leave, he will be looking for replacements. However, one of my colleagues talked to the boss recently, and apparently the email in question contained an error; the deadline for our decision was supposed to be about two weeks ago. I do not know the details of the discussion that followed between my coworker and my boss, but it was a heated debate.
I myself haven't responded to the email; I was trying to keep my options open and reply to him a week or two before the deadline, but obviously this is an issue now. How should I bring this up to my boss? I don't think it's a good idea to mention how I found out about the error, as it would remind him of his argument with my co-worker. I don't think I will get fired because I, like the co-worker in question, am relatively difficult to replace. Although I would prefer electronic contact, the boss seems to like to keep his employees "on edge" and doesn't always answer emails he reads.