>>18739748
You bought a bunch of tubes of ASEs (you don't have a strapped monster box since those are 500 ASEs) so it's no big deal if you open one of the tubes and handle some of the coins. I'm assuming the tubes were sealed? I'm not sure what premium, if any, the dealer would give you if you were to sell the tubes back to them. I have personally opened monster boxes and handled a few coins. I'm not too worried about a lesser premium because I'm expecting to sell my silver for a much higher price.
If you're particularly paranoid about tarnishing the coins, wash and dry your hands thoroughly before handling them by their edges. If you can wait, you can buy white cotton gloves to wear before handling the coins.