They may have just missed the 2x2 framing which is probably 1.5 x 1.5 inches. Take a small diameter wire or tool and find the depth of the wall and weather they even hit the stud. Use a stundfinder or tap method.
Use wood screw a half inch shorter than the full depth of the wall so you don't get through and secure the lighter weight box with screws at least 3 or 4 inches apart so you don't split the stud.
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