When you go to sell them don't put them all up at once or you will flood the market and the price will be driven down. With that much silver you could almost sink the silver market! My dad had a small cache in his later years and one summer he gave it all to the grandkids a little at a time and they spent it on pop, candy and bubble gum! I didn't know about it until a couple of years later. It was worth only a couple hundred dollars at the time but today it would be worth a couple thousand. It was small enough that I would keep it instead of selling it.
There was an oldman living in the City limits that was running an illegal junk yard when I worked code enforcement. He had about an acre of old cars, appliances and just junk. Almost in every piece of junk he had coffe cans full of coins. He died and we started to clean out the lot and started finding the cache of coins. So, I stopped the clean up and got in touch with his only living relative, a daugter. She and her husband came over and went through the mess and took a pickup truck load of 5 lb. coffee cans full of coins, some old and some new. The ones I saw opened were in no rhyme or reason, just tossed in the cans by the handsful, all loose change and bills rolled up with rubber bands. The daughter never would say how much she recovered or what all she found but she told me they would never have to work again. Last I heard IRS was looking for them and they had moved with no forwarding address. I'm still not sure the daughter got it all as she didn't ever go back when the lot was cleaned up to check for anything that might have been buried. The City finally foreclosed on the property for unpaid liens and now it sits in the middle of a large flood control lake. I wish I'd known then what I know now, but you know what they say about hindsight.
At any rate, your granfather's cache is one of the biggest I have ever seen and I am humbled by it. It isn't the find of the year by any means, it is the find of a lifetime! Monty
Hamina, hamina, hamina..... 
greatest finds for sure congrats to you and grandpaw 
Love the pics and the story !!! This is what we all dream of !@!!!!@#@#!@#!
