Probably Mafia.. scum in any case. I don't believe he received a letter.
How do you know someone else isn't faking it? Why just EK? 'Cause he didn't seem to know what you were talking about when you were requesting letters?
The action offers negative results, not positive.
If a person claimed a letter, it's a null tell since they could've just realized something was wrong.
However, while others took one look at their PM and one look at my question and went "OH!!" (whether they were town or mafia), ExKirby went "don't see anything".
It's sort of like if I talked to 5 friends IRL and casually said "you look scummy." 4 of them immediately said "I'm voting for them" or "lynch em" or "State your reasons!". Some may not have played mafia but caught on quick (the last statement might not have anything to do with mafia).
However, if the 5th person went "Does he have something on his face?" then it's a good bet that the 5th person hasn't played mafia and you can then see if he spent all that non-mafia playing time learning to fly.
Of course, you'll have to use other methods to see who was lying, but someone will be killed off in the night so your job is a little easier. It gets very easy when one person whines "OMG you killed him! You really killed him!" because clearly that person never played either (I mean duhhh that's what happens at night).
It's much harder when you have a larger group since the folks who havn't played catch on quick. A few gun-toting Vigs can help with that though.
...oh sorry, got a little off topic there I think.