Frank took the green beans and began to work, enjoying the way it occupied his hands and a small part of his mind. He always thought better when he was a little bit preoccupied with something that didn't require his full attention. After today, he had quite a lot to think about.
"Alright," he said, voice a little bit quiet but still calm, not disappointed or upset. "You needn't worry about it, then. Not until I decide it's a good time for you to look for it, anyway."
If he died and she didn't look for it, that was her choice. It wasn't anything essential, just something he'd put together while he'd had very little else to do in the last week or so. And he'd been telling the truth when he said it wasn't necessarily intended to be opened after his death, but it did serve that purpose. It was more about the gesture for him, anyway, because nothing he left behind could make dealing with his death any easier; it was more about knowing he'd done something to prepare for that eventuality, no matter how slim the odds were. It was his job to be difficult to kill, after all.