Hello Everyone - beginner here. I just bought a bag of 2019 BU Kennedy Half Dollars from the US Mint. Should I leave them in the sealed bag they came in or is it better to have them graded and slabbed. I originally thought I'd buy them and put them away for my kids and grand kids but then I thought they might be worth more when I pass them along if I have them graded and slabbed. I haven't even opened the bag to look at them since I thought it might diminish the value if I do. Just wasn't sure. Any suggestions would be appreciated!