Most of the newer Epi bags aren't faked because they're made a lot different from how they used to be made. They're a lot more flexible now whereas the older epi was really hard from the older treatment. I've actually talked to counterfeiters in Asia and they said that they don't fake the Myrtille because it's hard to match the color LOL. I wanted to see how real the fakes are since the really good ones are hard to authenticate.
but what wallet are you talking about? make sure the LV symbol on the right isn't deeply imprinted. Also look at the shape of the LV. Also look at the stitching.
FAKE:

Look at how the LV looks a bit crooked and it's too deeply pressed into th epi leather. Here's another one.

This one's shape is funny & it's too big
A real one looks more like this:

See the difference?
Also, when you look inside the wallet make sure that the stamp looks similar to something like:

Keep in mind how the 'O' in Louis Vuitton is fully rounded and doesn't look like an '0'.