Since 2010 ,
Official Sealed Transcripts are NOT needed any more when applying for E2 visa.
( but Canadian might need one official transcript when they get their Criminal record check and degree stamped by Korean consulate, please check out with Korean consulate located in Canada )
Please order one official sealed transcript.
It is very important that it is sealed in university envelop and there must be either university stamp or signature on the envelop. Please see the sample official sealed transcripts. ( Without stamp or signature, your visa application can't be accepted)