Image: Sucker Punch Productions / PlayStationOfficial screenshot from Sucker Punch Productions / PlayStation.
Lost and Found is an easy exploration trophy for finding one Pillar of Honor and taking its Sword Kit. One pillar is all you need.
Visit any Pillar of Honor and grab the Sword Kit waiting there. Kaneda Inlet in Hiyoshi has one early in Izuhara.
There are 23 pillars on Tsushima and 4 on Iki. Each one also counts toward the 30 Vanity Gear pieces for Slay.