dude just my opinion,,,, but unless i get a autograph from "the chief " or "our kid" i aint gonna take anyones word on authenticity on e bay

dont trust any memrobia thats buy it now , cus its fake , also nearly all the autographs are fake , sarah m gellar once said she was horrified when she when on ebay to descover laods of autographs , and only about 4 looked real, and wernt

Good question but, like Kalas noted I wont EVER buy "autographs" from anyone. Its like if Im not the one who fetch the john hancock then fuck it!
I mean theres some really cool items with alleged "autographed by Noel or Rkid" with some HIGH as fuck asking price but, how do you "really" know its a genuine signiture or not? So fuck it I'll rather just settle with the ones I get myself.
You know whats also a jip on ebay, those "presentation" cds they sell of Def. Maybe or MG and they ask for like $70-$80 bucks when you can go to a frame store with the gear you got yourself and tell them to frame it up nice and vuala you only poped bout $20-$40 bucks on it. Loads of those are not Official items presented to the band
Now heres what seems like a good one.

cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=83186&item=3877724090&rd=1&ssPageName=WDVW