First, eyeball the shape of the empty spot on the bone. Look for unique traits like particular curves or notches. Picture the kind of piece that’d fill it just right. This mental image can help you rule out some pieces from the get-go.
Pick up each piece one by one and see how it lines up with the empty part. Some will be obvious no-gos because they’re too big, too small, or just the wrong shape. For example:
Pieces like #2, #3, and #6 might have wonky shapes that scream they won’t fit.
Piece #12 could have a pointy edge that clashes with the bone’s smooth curves.
Now that you’ve narrowed it down, give the possible pieces a closer look. Rotate them to see how they match up. Pay special attention to the curves and contours—they’re your best clues.