No I don't think the MIBs are coming at all, so just chill.

You will get a follow up or possibly 2 follow up letters like I did, just don't respond to them, I shreaded mine. If anything more was to come of this, they would have already showed up. I won't use that particular iop again because they put all your credit card info with the purchase, so if something was to come of it, you couldn't deny it. That really bothered me.