Didn't report non-UC transferable courses.. how will this affect my chances?

<p>I took a couple of classes at my community colleges that are non-UC tranferable courses. When I asked my counselor if I need to put these on my application, she told me NO. Well, two days ago I called UC office to ask a question and thought I’d ask about community courses as well, it turns out that I DO need to list these courses, regardless of whether UC accepts them or not. I have written a letter to all UC campuses I applied to and will mail them out on Monday. My question is… how will this affect my chances? I honestly dont have anything to hide (I received mostly A’s, one B in these courses)… just that I didn’t know I was supposed to list them.
Also, when I mail in stuff for the UC, what type of mail would be the best? (media mail, etc???)</p>

<p>Thank you!</p>