IF (and that's a big IF, IMO) MT didn't suspect or know anything about why he was throwing bags in dumpsters, wouldn't FD putting a FedEx box in to a storm drain make the average person wonder? I think IF a person were totally inocent with knowledge of what was going on during this time, would have asked hey, what's in the box and why put it in a storm drain? And why is it in a FedEx box and yada yada yada. (And that's even IF she didn't know the license plates were in the box!) Nope, nada, I'm not buying it.
JMO