Everywhere I look, I only see vague references to "the tomb" and whether or not I'll need those cards again later. Without spoiling too much, will I need the Cook card later in the campaign, and if so, can someone tell me her stats + ability so I'm prepared for that event? If I won't need it again until free play I'm not worried.
In the rules, they explain the differences between "back in the box" and "in the Tomb," specifically. "Back in the box" means return it to the box until the next chapter. "In the Tomb" means "under the insert until we tell you to retrieve it." Neither are "destroy," when you actually tear up items (or "bury," which is basically the discard pile, just on the bottom of the draw pile for a given deck). But I suppose you've figured that out by now. At least it was only one card.
Here's the Cook, for future reference.
TALK: Place your figure on any Landing tile. This does not cost a move.