Speaking to an officer this last weekend, to quote him, "The burden of proof to prove you did not have them before 2000 is on them, and next to impossible to determine" and unless your a thug, most officers will be inclined to look the other way. They just don't have the time or resources to go after this.....
i would agree-just look at post-2000 mags. when i lived there, there were countless folks who had hi-cap mags that weren't even old enough to drive when the ban passed, yet they had plenty. i was always amazed at the number of new shooters who somehow got into the sport in the post-ban era in that state.