Everything will be fine........if you get paid and there is no catastrophic event that takes place while you have their freight on board. With no bond, you have severely limited your recourse in the event they refuse, or can't pay you. With no MC #, in the event of a terrible accident, you could share in the liability, or at the very least, be looked upon by the US courts as having participating in unlawful transportation, never a good thing. So when you say "it is all legal", no, it isn't, but like waiting for the red light to change at an isolated intersection in the middle of the night with no other traffic around, you'll probably be alright if you roll thru.