Good luck on those nickels!
If you aren't having any luck finding good coins in rolls, try getting rolls from multiple locations. What I do is I get a few rolls from different places (gas stations, banks, etc. and just a couple bucks of each denomination) and I mark where which roll came from. If I find a lot of valuable coins in rolls from, say, a gas station, I mark down the coin roll to go back to the gas station and purchase more of. By doing this, you spread out your search between multiple banks and thus increase your chances for success.