Or underfeeding him so that he feels like he has to stash some?
We went camping a few weeks ago and on his return he ran out to the garden and brought back a half decomposed duck wing!!!! I took it off him but I'm worried about him getting mentally damaged if I take his food away!! He doesn't understand that it was manky, he could have been looking forward to it all week and there was I swooping in and removing it.
I am worried about him eating them covered in dirt and soil and the possibility of confusing him. I don't want him to think another animal is taking them, surely that would make him unsecure in his own place?
Currently I do nothing except take that obviously grotesque duck wing. Otherwise I leave him to it.
Mine does this. He seems to prefer them manky. I started off flapping and trying to keep everything clean. Now I just tell him that he's vile and is entirely responsible if he vomits green chicken. I move stuff if I find it but he does regularly chomp stuff that has been stashed all day and is still here. I just try and gather by the end of the day. Only once in my mothers huge garden he did come over with a wing that was clearly from the week before. I made him hand that over!
I think it is likely he is not hungry if trying to hide.
In the nicest possible way I think you might be over thinking it. I don't think dogs look forward to things all week in the same way we do nor do I think he will be mentally damaged or made to feel insecure. I regularly sweep the garden for my pups discarded and frankly disgusting bones and chuck them. I don't care about him eating them but i draw the line at him bringing them inside.