checks? Take a look at these please?

[Will Bozarth]

I'm a huge Vincent Price autograph collector... I just purchased my 5th autographed item. I'll post my last 2 purchases, with hopes that someone could declare these as authentic. I purchased two checks from the seller within a short time frame of each other.

http://i8.ebayimg.com/01/i/001/06/6d/e6a5_1_sbl.JPG
http://i14.ebayimg.com/06/i/001/04/d9/511d_1_sbl.JPG

I'd like to think that it would be INSANE to forge writing on a check like this, so I was wondering if it could be confirmed that these types of items are pretty much guaranteed to be authentic?