I agree that the binman should have realised that something was not right. If C was in the bin the driver would surely have wondered why the bin was so heavy to move to the back of the truck. Lack of DNA could be because it was some time after C went missing before forensics were done and I am sure the lorry would have been cleaned during the intervening time. We don't know if the load went straight to landfill or not, but MOO is that it didn't, or at least, not straightaway. The landfill site is not open 24 hours and I think I have seen somewhere in my recent research on this, that there is a number to call if you need the landfill out of hours. It would be very suspect if that was used.
Could you tell me please, where and when we were told there was no sign of him through the other checks? As far as I am aware, nobody has confirmed that the load was taken to a Waste Transfer Site, or processed. The only clue to that, and I am not certain that it definitely means it was checked, was said yesterday by the police, whatever her name is, in the interview at the landfill site, something to the effect that they didn't think he would be in landfill originally because of the processing the waste would go through and it was, at that time, and I quote: "likely, Corrie would have been identified before he got here" (approx 14 mins 10 secs in the video). We can't be sure whether that means he was missed at the WTS or if the load was not processed at all.
Another video on BBC Look East FB page, there is a video of the live report from the site and at 8 mins 52 secs in, the reporter says "Police knew that load came here"
Waste food goes to a WTS too. In fact, just about all waste goes, or should go, to a WTS first to be sorted/baled and then sent to the appropriate facility.