From what Valachi said they inducted hundreds of guys in the 50s prior to the "closing". In his memoirs he was moaning about the calibre of a lot of the guys they made, he was also the one who spoke about Frank Scalise making guys for money around that same time period (can't remember exactly when he got killed, 1957?). I'm not clear though on whether they made a ton of guys because they knew they were closing the books or that they closed the books because they made so many
I see it as strange for Valachi to criticize the quality of guys being made after what he did. He ratted openly. made quite a bit of stuff up, or the feds made it up for him. He went nuts doing time, and it turned out afterwards that his family had a big history of mental illness which apparently was passed on genetically to him.
