35 years ago, I was not a fan either, but when you spend serious money on your collection, it becomes mandatory. Slabs also provide physical protection. I used to buy custom made Capitial Plastic holders for my best pieces. Slabs eliminate that need.
I would be floored if the V nickel got the environmental damage label. If anything is wrong with it (by my eyes) it's very light wear. What is it you see in it that I am missing that you think might be a concern? I'm sincerely asking, btw. I admit I am not overly knowledgeable on everything numismatic, so I appreciate perspectives that I haven't quite caught onto as of yet. The buffalo would solely be for the grading, no mention of error. That's one that I had gotten for a good price and one I would part with if it came back half decently. Not personally attached to the coin, and if it can return the cost of the whole album plus some extra, I'm ok with that.
The Liberty Nickel has black spots all over it. Look at the circulated nickels that might be in your pocket. Do they have black spots all over them? Copper-nickel corrosion is mostly black, sometimes green. It’s touch and go as to whether it gets a straight grade. The Buffalo nickel faces similar issues. Even if you get a straight grade, it won’t be a coin that collectors are not lining up to buy. Most collectors want grey colored circulated nickel coins with no planchet issues. I am trying to save you some money. CACAC has a tougher reputation than PCGS and NGC. They won’t be easy on anybody at least for a while.