Location of stamped PN on catalytic converter

I had to replace my driver side catalytic converter(s) and I was seeing if I could get a few bucks for it from a scrap yard. They are needing the stamped part number on the converter in order to quote. Mine are covered in surface rust and nothing is visible to me. Has anyone ever seen where the stamp location is? It would be helpful to find a general area to wire wheel. Here's what the numbers look like https://rrcats.com/guide/toyota/

 

They won't give you hardly anything at all that would be worth it. It takes quite a few to get any descent amount. Thats one of the reasons why thieves steal so many.