Daegu EPIK demanded the originals of both, and then refused to return them to teachers when their contracts finished. A buddy of mine almost couldn't get his visa transferred to a new school (after EPIK didn't renew him) because the immigration office wanted them, and the education office refused to give them up. Finally, after hours of arguing, they gave him copies of the originals to give to immigration.
The boards of education in this country are ridiculous.