Wow, what are you gonna say when I tell ya that I use a nail to mark my coins that I've checked. Just kiddin, gotta go:vanish::vanish::vanish:
I have considered it, but didn't for reasons others have stated. I do mark the wrapper (unless its older, then I keep the wrapper) and even research rolls I have marked. I found 2 40%ers in rolls I had previously marked. Must have been another searcher rerolling in used wrappers and accidently mixed silver in.
Anybody with a decent scale can check rolls for silver without opening them. If you are just checking for silver, weigh them, if no silver mark the rolls. Why ruin the coin for variety searchers? You can search a lot more rolls by not opening them and just weighing them. I pick up rolls of halves every now and then, I weigh the rolls, If no silver then I keep them nice and neatly rolled, and spend them during the course of the week. I take a quick look for the fg.
Maybe I should have given a little more background or reasoning for marking. The rolls I am getting are professionally rolled. I can't reuse the paper. I am searching Halves and I try and only mark the high mintage dates from the 70's. I don't know what happens to them after I turn them in. I am guessing that they get rewrapped by machine if someone orders them. If that someone happens to be me then I will know. Maybe marking is bad but it's not as bad as drilling or gouging as I have seen. I have come accross many marked coins that the marking is pretty much faded. I mark four coins in a roll and I have yet to see one of my marks yet. If I start seeing them consistently then I will know that I have exhausted the supply of unsearched halves. I'll have to sit out a few months and wait for more people to cash in old stuff and start again.
I haven't done roll-searching in a while but I always mark the wrapper, NOT the coins. It's usually a faint "X" that I will know where it is. Never ever mark the coins guys and gals!!