[mothered]

I have bought a new GPU from Amazon which is almost identical in appearance to my old one
I'm thinking of returning my 3070 in place of the 3080 Ti.

Amazon Is meticulous with checking returns, hence It's very likely they'll Identify the Incorrect Item.

Also, It's their policy to dispose of wrong Item returns, so say goodbye to your RTX 3070.

It also requires a OTP if thats relevant.

In that case, the DNA Is out of the question.

What is the best method here?

The wrong Item received or box them.