On the stairs leading to the Boathouse.
On the top of the Boathouse wall, from the stairs' side
Above the Boathouse entrance.
In the underground passage leading to the Seventh Floor.
On the wall in the underground passage leading to the Seventh Floor stairs.
On the stairs leading to the Seventh Floor.
In the window next to the armour on the stairs leading to the Seventh Floor.
In the Library, between two bookshelves.
At the end of the Library, behind some bars. You have to break the crest by throwing it at the wall, get it through the bars and reassemble it with Reparo.
By the Library exit, on the left. Use Reparo to reassemble the crest
On the wall on the right, after exiting the Library.
In the stairwell which you can enter by leaving the Library. The entrance is on the left side. The crest is hanging from the wall.
In the corner of the corridor by the entrance leading to the Transfiguration Courtyard.
On the flag hanging beneath the ceiling in the corridor by the Transfiguration Courtyard entrance.
In the corridor leading to the Potions Club look into the pot standing in the left corner.
On the Seventh Floor, above the door next to the tapestry.
On the Seventh Floor in a narrow opening between two pillars.
On the Seventh Floor, on a flag beneath the ceiling next to the cage with a potion recipe inside.
On the Seventh Floor, on the right side of the room into which you can get through the corridor perpendicular to the cage with the potion recipe.
On the Great Staircase by the wall on the right, around the middle floor.