Thanks Paatmaann
Tough to say how much money it was, but it was enough to finally satiate Walt's hunger. As he stated, Grey Matter is now worth billions. Suffice it to say the pile of money was...a lot haha.
Hank's a smart guy. He knows this is a chess match and he knows the best thing he can do is to keep Walt unaware of his knowledge for the time being. That means keeping it secret from Marie, Walt Jr. and Skyler (ha!) too. He'll probably tell Gomez and they'll conduct an investigation on their own. We pretty much know that the government higher-ups would say "Ok, you have a book with a note in it. Get back to !@#$ing work."