Any memo produced was created on a computer device and produced on a printing device. Both computers and printers have memory and leave tracks. If he did it, it can be found if there is the will to do so.
I assume it was a handwritten memo. Comey testified that he gave it to his boyfriend and he doesn’t know where it is now. If it was a computer memo then he would know it was on his hard drive. From his testimony it would appear that it was done by hand. I do those all the time.
But I doubt if there was ever a memo. It was just a story.
Comey better STHU and keep a low profile. He committed a felony by leaking the memo, or if there is no memo, he committed a folony by lying about it.
He needs to go into hiding with his boyfriend. Unfortunately I don’t think Russia will give them asylum.