I haven't read all of the above, but in general, everything which is considered a "consumable", is yours, you have paid for it, you can take it.

Everything else, (solids) and (washables) are not yours. Like the Bible (may be the Kuran here) for example, is not yours.

Blankets from planes... are not yours.

When i first arrived, my company put me up at the Ramada for 3 nights. On my way out i wanted to take the Marhaba book which i found very handy for first timers. So i asked at the front desk, and the girls were more than happy to let me go with the book (because it is a sort of consumable, it has to be replaced after a few weeks or so...). Cheers.