Jeepmn,
5-silver days are awesome in my area--good job! Not sure if some of your coins came out of the ground with the rub marks on them, but if you're rubbing the dirt off them when they come out of the ground, I'd recommend you use a different method to get the dirt off--you can literally rub hundreds, if not thousands of dollars off a coin. Take some water with you and pour it on the coin, or just wait until you get home to properly clean. Just my two cents. Good luck.