Why would the Yankees file a lawsuit against the construction worker who buried the Red Sox jersey?

Am I missing something here? Please tell me if I am!

It was a jersey...why would they file a lawsuit for burying a jersey?

http://boston.redsox.mlb.com/news/article.jsp?ymd=20080413&content_id=2523286&vkey=news_mlb&fext=.jsp&c_id=mlb
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