jf1q thought I could just check it from model number from some site.
That would be nice, but I don't believe it's possible. A Pixel phone doesn't know whether it's carrier-locked or OEM locked until the first time it gets an Internet connection - it asks Google. This saves money - the boxes can be the same, etc.
Some phones have different radios for different countries, and I believe that shows up in model numbers.
If it was a Verizon phone it's hopeless.
Edit: let us know!