I mean, my move is to just give a family rate right away. It's like half off or something, idk, it makes it a real thing they have to think about.

Your suggestion to map rocky zones first has merit, but it can lead to missing other important details. A full survey often catches issues that isolated mapping misses. Starting with a broad overview tends to work better.

But what if you need the money now?

Rushing trains your muscle memory wrong for when you return.

Last time I traded a camera at Best Buy, they just turned it on and clicked the shutter. Most places do a quick check, not a full look inside. If you get it working, it might pass without you lying about anything. The store checks it themselves, not you. You did the repair asked of you. I doubt this is as big a moral issue as it feels.