FYI to folks here: I emailed the Canadian embassy in Seoul. They recommended that I obtain a regular police certificate and include a cover letter with supporting documents (I included their email!) stating that it is not possible to obtain the one with lapsed records. I also emailed the Korean national police and got confirmation from them. The reply came from the migration section of the Canadian embassy, so I assume this is what IRCC are currently looking for.
Here's a copy of the email:
Dear Sir/Madam,
Thank you for contacting the Embassy of Canada to Korea. In order to get a police certificate in South Korea, you should visit a local police station in South Korea.
Please kindly be informed that the Immigration, Refugees and Citizenship Canada (IRCC) has continued to ask a permanent residence (PR) applicant to provide a Criminal (Investigation) Records Check Reply
including any lapsed records as informed via its official website.
We recommend you to submit the police certificate that you were provided by the police station with a written statement (cover letter) explaining why you are submitting this type of police certificate and the reason you cannot submit the “Criminal (Investigation) Records Check Reply (범죄· 수사경력 회보서)” police certificate containing any lapsed criminal records when you apply for your application. If you have any supporting documentation, we recommend that you also submit that document.
Please note that your application may experience delays or additional documents/ information may be requested by the IRCC office responsible for processing your application.
If you have any further enquiry on it, please use IRCC’s
Webform to submit your enquiry.
Hopefully, it helps.
Regards,
Migration Section - Section de Migration
Embassy of Canada to Korea | Ambassade du Canada en Corée
21, Jeongdong-gil (Jeong-dong), Jung-gu
Seoul, South Korea (04518)