Of the latest number, 2,871 cases involved smartphones and 610 used hidden, compact cameras. In Osaka Prefecture, the number more than tripled to 257 in 2020 from 78 in 2010.

East Bristol Auctions Secret message capsules were attached to the legs of a carrier pigeons A miniature spy camera sold for £980 and a hollow key, used for holding secret messages, sold for £680.

Also up for sale are a piece of explosive coal, a miniature spy camera and a miniature radio listening device. The secret items, hidden in everyday objects, were originally distributed by the ...