Valachi's knowledge was mostly limited to NY. When asked about other families such as the Outfit, Detroit, Philly, Florida, etc. he either embellished or told his handlers he didn't know. In fact, it's now become known that his knowledge for the most part was only limited to the Luciano/Genovese family. And he only had general knowledge of the other families, like who the bosses were. He didn't know what the other families were involved in, or who had got moved up and who didn't and who were the Capo's and soldiers, etc. The feds actually fed him information during their debriefings of him to make him more credible.