I am not sure if everyone knows this...but SK HQ monitors the sale of SK stuff on ebay. There is a woman named Julia Kozicki (in-house legal council) that contacts the sellers. I have emailed her a couple of times to give her a heads up of items on ebay, and she has told me that it is much easier to get the badge/songbook/etc back if the seller hasn't been harassed by SK alum. I know it is difficult to not get upset (i get mad too), but email Julia at SK if anyone sees anything on Ebay!
Julia Kozicki
jkozicki@sigmakappa.org 
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