Buffalo Nickel 2005-D common error?

I was going through a few today and I found a lot of nickels that have the S in States filled in near the bottom, it looks to me like its a cud, or maybe a die scratch or something... I looked around on ebay and didn't see ones that looked quite like the ones I found. It looks really cool on a few of the coins, almost like a weave around the S. The others just look like there is a line above the bottom curve in the S. I will have pictures tomorrow. Do you think these sort of errors will be worth holding on to, or should I just give them away heh?
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