You, as Frank Hardy snoop Olivia’s shop at night with your brother, Joe. The only notable items here are on the counter: the strange note with symbols on one side and a map on the other. Click on the map to comment on it. Then click on the paper (that you cannot pickup) underneath the cauldron. Frank comments on Abigail Hathorne Woodley and how we need to find her grave.
You can click on the box on the floor underneath the rack of clothes, but that is all. Leave and head back to the cemetery.
Starting at the gated entrance, look at your map. The top center here is where you are at, the entrance. Down here in the center is the path to Hathorne house. Since only two gravestones are labeled on the map, you can note the rest yourself, however, you can skip immediately to the tombstone to the right of the entrance (the tombstones you are looking for are the large ones with legible names that you can inspect closer.)
You don’t even need to identify the graves – you only need to know which grave is the one on the map with the X, which is Samuel Sewall’s, located to the path on the right from the entrance to the cemetery. Inspect the bush on the ground in front of it.