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Hi, I'm Mike G and I'll be assisting you. Could you upload a picture of the box?
I only see 1 cable in the box. Send a picture of the mounting plate for the fixture. If it is solid with a 7/8" hole in it you can wire it without a box.
Not a rip off. Today is a holiday and I'm not sitting by the computer all day. The fixture will need a box. I suggest getting an old work plastic box. It has a built in means of fastening it in place. Turn the power off, destroy the existing box in place. Cut the hole for the new box. The cable should be long enough to reach the new box, cut a round piece of drywall to fit, with Durabond butter the edge of the old hole, push the round dryall plug into the hole flush with the finish and allow it to dry, finish coat with Durabond. Durabond doesn't shrink so tapeing the hole isn't necessary. Happy New Year.