Help about 2K Bundle!

Nope, you won't be able to redeem them to your steam, can just give away the link though, it's EXTREMELY rare you get inventory copies, almost never from bundles and such.

I'm assuming you mean the Steam inventory, so no. If you have the game in your Steam library already, trying to redeem the copy from the bundle will not do anything.

As far as libraries go, Humble Bundle also has its own library for DRM-free versions of games. If you want to have those DRM-free versions appear in your Humble library you can claim the page for the bundle on your account, however I believe any games that are gifted will not give the DRM-free as well to the recipient, only the Steam key. Claiming any bundle pages is entirely optional. Note that anyone can view and/or use a bundle page that has not been claimed if they know what the link is, so be careful what you do with it.