A frown pulled at his lips, absently raising a hand whilst shrugging.

"I've not the slightest. Though it had been a week's time since we'd acquired our guests, precisely. Perhaps the expired have an expiration date themselves here... Not much else makes sense."

Tilting his head to look up at her, he seemed to think on the latter question for a moment. He wouldn't just give up, that's for sure.

"And if that's the cassse-- well. I suppose I'd just have to work much faster. What a challenge..."