Wow - reading your description of Oscar could be me describing Pip !! I can find anything in his bed - undies, socks, tissues, he had a yellow duster the other day. He buries his finds in his bed, behind the curtains or in the corner of a room. When he is 'burying' something he sort of scrapes the floor with his nose towards the object. He does this with food too. The worst is when I find a doggy chew 'buried' under my pillow - Yuk !!