The sketch included a certificate of authenticity from And Comics, Too, a story where Guillory had done a signing just this past October. It is pictured below.
Both of these are fakes. Not only did Guillory deny the sketch, but the owner of and Books, Too pointed out that the "a" in the store name is not capitalized, and wouldn't be on the COA. The seller claims he bought the sketch from someone else and was just trying to flip it. The auction was taken down shortly thereafter.
And shortly after that, these two sketches by Robert Kirkman from the previous seller were discovered on eBay.
And, like the auction above, this one also comes with a COA, from Meltdown Comics.
And, like the auction above, these are also fake as a three dollar bill. The auction was pulled shortly thereafter.
Now come reports of at least six shops in the Michigan area have been approached by someone trying to sell the phony Gillory sketch, the phony Kirkman sketches, and also a sketch by Fiona Staples that is likely phony, too. The sellers story is that they got the sketches in person from a show in Toronto. So far, no one has bought them.
(In an interesting note, Wonderworld Comics in Taylor, MI, was one of the stores approached. The guy had read the coverage on Bleeding Cool and recognized the phony art right away. But he played stupid, saying he had to consult with other people, and got the guy's credit card information and some nice pictures on the store security cameras. Guess what's on its way to the cops.)
So, if you are cruising for original artwork of your heroes or run a store where you are approached, be very careful. And spread the word.
We must look out for each other.