Think what would happen if Trump released tapes of his recording the FBI director?
That would be pretty bad for Trump and Comey.
Comey has to know they are real or he wouldn’t be playing CYA. Which is exactly what he’s doing.
Bad for Trump? Only if the information on them is bad, then Trump is a fool for disclosing them, and he is not a fool.
But, there are no tapes. It’s just that none of his enemies can be sure.