So I have to suppose that you would climb in The Bin and move the rubbish about so you could bury the corpse underneath.
I don't know how wheelie bins work elsewhere, including in Luz, but this is how they work here.
The bins have a large steel tube at the front bottom. You stick your foot on this and the top pops up, enough to dump your garbage in.
I never look inside a bin. They get disinfected from time to time, but they are normally very stinky. They often have hordes of flies inside. All I want to know is if my rubbish will fit in, or should I use another one. (We have 3 close by).
The Dispatches 2007 programme linked to by Holly should show if the Luz wheelie bins had that steel foot tube to operate the lid, should anyone care. That programme is also correct, IMO, that the only way of searching such a large bin is by dumping the contents to somewhere the contents can be picked over. There is no point whatsoever in simply opening the top and peering in.