I would leave the bag sealed. I have a sealed $200. Philly mint bag of 4000 1962 Jeff Nickels that I bought in 2010. I have no intentIon of opening it. I just bought the bag because it was a good price, and something I rarely saw. I paid $300. At the time, nickel was rising in price, and I thought it might be.more valuable at some future date. I bought the bag, and not the coins! In my opinion, I do not think it is worth the hassle to sort through A bag of common date, modern coins. But, everybody has a their own opinion on this. Please let us know what you decide to do.
If that bag of nickels were mine, I would be stacking them all over the table looking for errors, varieties and Full Steps.
I’m going to assume you are not a collector of that coin or you likely would have opened it already. If you want to make some profit don’t open the bag and sell it. You got a good price on it. If you know what your doing and want to take a “shot”at a larger profit then open It and start searching.
I would sell it unopened (mention the PCGS prices for the MS-67 and 67+ coins) and hope to find a treasure hunter with stars in his eyes who doesn't understand probabilities.
Oh heck yeah. "Toning" is a form of corrosion. It goes through the different colors, then to shiny black, then to matte black. When it hits this stage, it is corrosive to the underlying coin. I have dipped matte black coins and it was deeply pitted underneath the toning. Toning might be pretty, but if it continues it simply consumes the coin.
Thanks. I learned something. I didn't think Gold or Silver actually "corroded" I could see silver tarnishing but never thought it would pit the metal like regular steel would do.