I've been searching around the internet for the last hour, but mysteriously somehow, I've been unable to find the Gmail keyboard shortcuts to hop to the page of the next 50 older or newer messages (or even find people frustrated if they don't exist).
I know about the J and K for moving up and down the current window, but once I get to the bottom of the current page, I want to be able to hop on to the next messages. Do these shortcuts just not exist?
Edit: I wanted to update this since this question is getting some traffic. There appears to be no way to do this when you have tabs enabled. However, switching to priority inbox (or maybe just disabling tabs) makes
K move from page to page.