Also having this same issue. I've had a 3080 and the monitor (Dell S2721DGF) for several months, but it just recently started to have the quick flicker across the top of the screen. It's connected via DP. Second monitor is HDMI, no issue. I replaced the DP cable, and it seemed to stop for a...
The box had a little dent, but was sealed. I just told them about the residue, as well as the scratches going over trace lines, and how I'm worried it could cause issues. They processed the return and sent a shipping label, but also asked that I send them photos, which I did.
I just got a motherboard from Newegg, and when further inspecting, I noticed scratches on the front and back. Here are some videos of them:
I can add photos, as well, if needed. I know traces can be damaged this way, but I can't tell how bad it actually is.
There's also some white...