Forum:MW2 - Help with Hijacker challenge

I'm currently playing MW2 with the intention of completing the Hijacker III secret challenge (Steal 200 enemy care packages) and I've run into some info I need clarification on. I'm already clear on which care packages are eligible, but I'm confused as to what level I should be at. I know your supposed to be at lvl 61 to get steals over 50 credited, but I recently read that you should also be at least at 1st prestige. I'm currently on my original playthrough at lvl 70 and have never prestiged in the game because I know that the counter for the steals resets if you prestige. Thanks to anyone who has tackled this challenge that can clarify this for me.


 * Note: I'm not looking to complete this via modded lobbies, so "Thanks, but no thanks" in advance.