The term comes from bags of Morgan dollars. When coins are in a bag, during movement they tend to hit each other and make little dings on the coins. "Baggy" comes from the word bagmarks, which means the coin looks like it has some little marks on it, not from circulation or damage, but from contact with other coins. It could be on the plastic, but it just looked like some little nicks in the fields of the second coin. Any little hit like that by definition would keep it from being MS70.
It would be interesting to see how PCGS or NGC would grade those, but I doubt it would be worth the money.
Even if they are 70's, you would never get 70 money unless you get them into PCGS and NGC slabs, so just enjoy them as they are. That includes 70's that are all already in NGC and PCGS slabs. If you figure in inflation he got an even better deal. It's the guy who bought them originally that lost. If they had just kept up with inflation, no growth over initial price in real terms the Ike would be over $60, and the Olympic dollar over $75. So in "real dollar" terms he got them for 1/3 issue price or less.
I agree the buyer got a good deal, but I disagree with the original buyer "lost". How much enjoyment did the original owner gain from owning them? I bet you quite a bit. That is how I measure my collection, from how much enjoyment I get from owning them. I figure if I get as much enjoyment out of owning them as I paid, anything I sell them for, (or my heirs), is "profit". Its a hobby. Not every return collecting coins is monetary.
Take it from a guy who buys directly from the mint Chris........aftermarket worth is not much my concern. Not always though......I've counted coup on a few things, but for the most part, I just enjoy picking up these pieces/sets.....