naomi, I find your posts and queries of others are increasingly obtuse and pointless.
My point is that the police were incompetent at best to just accept that a lorry would go to the tip and pay the entry fee just to tip 11Kg of waste. All this is beside the point, which is to try to come up with a viable theory of what could have happened.
I still think that by far the most likely explanation is that, finding himself inside a bin lorry Corrie got out as soon as it stopped moving, which was at Barton Mills. He then wandered off to try to find help , but being unsure of where he was and still disorientated he fell into one of the many drainage ditches in the area and drowned. I suspect he is still there, but short of getting 100s of people together to search a huge area of open countryside he is likely to remain there , possibly for decades.
Thetford forest where you suggested he may be lost is a good few miles ( 10 miles at least) to the North of Barton Mills.