Mirror panels (Penn Hills)

I have about 14 mirror panels. They are all between 7 and 10 inches wide (most are 7 or 8) and 35 to 55 inches tall (most are near 55). They were previously attached to a wall with mastic and these are the panels that survived removal. There is still some mastic on the backs that prevents them from laying completely flat. It can be sanded off but I just haven't.

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