Auotgraphed football

I have an autographed football signed by "John Madden" (it was signed in the early 80's and is in the original package still). I am sure that it is not worth much but I an curious if it has any value at all. If any one can help I would appreciate it. Thank you in advance!!
 
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White Buddah

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Does is have any authenticity paperwork along with it??
 
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