There’s no reason to find one that’s already unlocked. Just find one that you know is unlockable. Any non carrier model pixel 10 should be unlock able. You just need to figure out what exact model number or whatever is the non carrier version and specifically get that.
I found someone online who say they had to put a SIM card in their phone before the OEM unlocking option was enabled. Maybe try that if you haven’t already? Idk about the pixel 10, but on my 9a I don’t think I had to jump through any hoops to enable it.
