Artefacts were on display at World War II . Staff launched a search for the wooden plaque and replica textbook . They were loaned to the university by Okinawa's Peace Memorial Museum . Tourist returned the artefacts and offered an apology to staff .
Artefacts were on display at the Kaetsu Educational and Cultural Centre . Staff launched a search for the wooden plaque and replica textbook . They were loaned to the university by Okinawa's Peace Memorial Museum . Tourist returned the artefacts and offered an apology to staff .