MS found under a wall
At some distant time in the past, a wall was taken out of our house, and sometime in the 1950s one of the subsequent owners boarded it up to re-separate the two rooms. When the wall was rebuilt, it wasn’t actually fastened to the floor, so it appears that small children had hours of fun wedging things under it, to be discovered half a century later when the whisking brush of our vacuum robot dislodged them and pulled them out into the open.
Eventually we’re going to have to pull the wall apart just to see what surprises might come out.