Content Protection the nice way

A few weeks ago I found my content posted in the forums at Plenty of Fish.  Can't blame ol marcus though, it was a member who posted it.   She got it off my site in 2003.  It's still getting traction.  Kind of nice. 

So anyway.     I was going to contact Marcus and see if he can't attribute the source..  I have copies on the Way-Back-Machine showing it was first put up on GrownUps in 2003, he can verify it easily.  But you know, there are no live links to owner on POF?

So then I thought I'd just join, and add a post to the thread with a link.  but then..  that seems..  I dunno.  Any user can make such a claim and start something that could turn silly.   What's a polite way to not rag the site for a members probably innocent error, but protect copyright on my content?  I'd rather validate my claim with the owner personally, and have HIM make the edit and add a credit and link to the post.  

Anyone ideas?