are plain packaged meat kfp
If kosher certified and the only ingredient is meat, that’s fine. You don’t need a special pesach certification.
the only ingredient is meat but there is no official ingredient list still ok?
Yes
What about kibbeh balls? Ingredients are beef and rice.
It’s hard to say without knowing how they work. I’m assuming the rice is cooked? Were they cooked in non K4P pots, etc. I would avoid.