The resender will mail links to everything, claimed or unclaimed (or at least, it did so when I last used it). I have hundreds of bundle games on humble, so my resender list is loooong. But it's alphabetic, if I recall correctly.
Just tried it again now. With my current email address I only get the two I bought after updating the email address. I entered my old email address, and after about 1 hour, I get a list of keys for games named A through T. Maybe the rest will come, eventually. Or not.
But everything is listed, claimed or not (all mine are claimed, but I got my DFC page with the resender). But the mails go to the original purchase email, not your current account email. I guess support may help with that. I still have access to my old email, so it's no biggie for me, just an inconvenience.
Edited by Mr Moo, 14 March 2016 - 21:56.