[mothered]

They sent a close up picture of the box, which was definetely not mine and looked padded inside, which mine was not. Rep said all they recieved was a empty box and paper. I never sent paper. Called UPS, they said there were no notes attached saying box was modified in transit. Talked to UPS support, not claims though, so not sure if claims can see more than basic reps can
I replied saying that isnt what I sent

Please reply when you receive their response.

Is there anything I should be worried about? I mean after all, why is the inside of my box padded? What paper are they talking about?

They're obviously lying about your shipment.

Tell them to email you a photo of "your shipping label" attached to the box they've claimed Is yours. It must be clearly visible with no signs of tampering/manipulation. As such, It prevents them from reprinting the label and sticking It on the box.

[cannyvalley]

you failed miserably. Keep the item and take the loss

Why do you think this? I would think OP is likely to succeed, though maybe not depending on the company.
Also, wouldn't the error on the company's part only serve to increase the chance?