This is an area of collecting anyone should shy away from. If you are looking to just display them then cool, but if you ever want to resell dont, unless you have them authenticated. The autographs look to be in person, but you really cant ever tell. There seems to be a lot of bleeding, may be the marker, or the stopping and starting when writing.
Authenticating them could cost a lot, and as I said, if they are just a display thing then it is not necessary. Either way at the price you purchased them, it wouldn't hurt to get some authentication done.