"I noticed it happen when I took food," Duck said thoughtfully. "But it must be a weird mechanism. I mean, it doesn't have cogs or anything. Or maybe there are, like, claws that drop down when you're not looking to replace stuff! And!" She waved her hands in her excitement. "Maybe there are, like, invisible tunnels in the mailboxes that send the letters!"

She dashed over to the mailbox (apologising to Setsuna for pushing past him), opened it, and tried to stick her arms inside to find the tunnel. She frowned in annoyance and then sighed when she found none.

"... Well," she mumbled, "was worth a shot."

Duck turned to Kyouya again and with a smile asked, "Could you? So we can be completely sure?"