Cat? Sherlock thinks... how small he must really be.
He sits against the glass.

He knows all to well what people do with something smaller or weaker than themselves, even if they don't want ... information.

Maybe being given to the cat is the better option.
Discounted due to damage.

The only persons to want this sort won't be benevolent. He might feel bad for the person that needs help but - he can't hear them. It's not like he could do any -
Wait a moment. They're all Muggles. So the sale is ... illegal. Still. Might do to try and remember faces though it probably won't do much good.

Still. Something to put focus on, instead of shaking in terror.