If they weighed 2.82 g in uncirculated condition then there might be some interest but as they show average circulation wear, it is no big deal. The planchet was probably near the lower limit and then add in wear and its underweight. Also, just because a scale can read to 0.01 g doesn't mean that that is the scale's accuracy. Quite often, and probably in most cases, a scale's readability is better that its accuracy.