Quick note, received both versions of the Cinderella SteelBooks today, and both have that clamp or whatever dent in the back, so they're going back.

Please inspect them carefully because the dent is somewhat difficult to spot, the back of the "J" card sometimes covers it, so I would suggest simply ripping a small portion of the cello to verify if it's a concern.

Returning an unsealed item can be difficult at times and involves the manager.