17. They have a computer question. 

“Kuroba-kun, it’s Hakuba Saguru… from school, you remember?” A pause. “Ah, I mean, of course you remember. Well, ah, anyway, the reason for my phonecall – and for disturbing you so late in the evening, apologies for that, incidentally – is that I’m having a little bit of trouble navigating this auction site… You see, it’s a connection with an internet black market and I’m trying to find a specific gem. What… key words do I need to put in? ‘Stolen property’ brings up far too many listings, it’s getting frustrating. Please help?”