He'll probably learn the code eventually. Prim hasn't exactly been dishonest about Panem and the Games, but she hasn't had much reason to talk about them. She has flashbacks on occasion, though not nearly as bad as when she first got back to Itinere. The most she usually says is that she's remembering the Rebellion and the war. There are some things she just doesn't like to talk about with other people.

Her coma and her sister's death are two of those things. The Games have also become part of those things. And mockingjays.

For now, though, she just glances at him as he pulls the truck out and starts them on their way. "I know. I trust that you wouldn't. I just..." She purses her lips and looks down at the basket. This is all tied into those things she doesn't talk about, but she's starting to like Tim and maybe even trust him a little bit. "It's easier if I have something in my hands. I guess it keeps me grounded. It... reminds me that this is real; it's not just a dream."

He might have noticed that this is a thing with her. Usually, it's nothing really noticeable, like herbs or containers from her shop, small string, things she uses every day. But she keeps her hands busy, if not simply resting on something or gripping her pants or the hem of her shirt or something like that. She isn't like Finnick was, though; she doesn't tie and retie a thick piece of rope. She just... keeps her hands on or around something firm.