These are printing plates. The reason the one has P3 is because the actual card must've had the number in that color only. Some companies inserted these in packs and we list those as inserts. Some companies "back doored" them (knowingly or unknowningly). Generally speaking, back-doored ones are hard to checklist because we have no idea what made it out the door and what is still toiling ina warehouse (or got destroyed as was the intent in most cases).
That said, I have no idea what the case was with these. I'm sure C2C will have it solved within the next 24 hours. :)
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).