(Strip Number 613, Original Publication Date, 17 May 1984)
Panel 1: We start off with Michael asking Elly why she's busy poking around inside the Magic Crawlspace Of Destiny.
Panel 2: Instead of explaining why her head is on backward, she tells him that she's looking for things to put in the yard sale. As she does so, she pulls out a round grey object with small red balls hanging off of it. Said object is described in the catalog as perhaps being an infant's toy.
Panel 3: He gets quite vehement when telling her that she cannot sell the mystery artifact because it's his very favorite thing in the whole world.
Panel 4: He then looks at it up close and tells her that he doesn't have a clue what it is. As expected, we have gobsmackage.
Summary: Remember how howtheduck reminded us of that Lynnsight about the ugly carving that Ruth ended up selling? My guess is that we're in for the family wanting to keep their old junk while getting rid of Elly's because they're selfish and want to erase her from history or whatever. This gets annoying because we're dealing with a woman who regularly rummages through his room looking for stuff she can arbitrarily toss out.