This was what was in the e-mail from LA:
Passport
requirements
We require an original VALID passport for yourself and every accompanying family member.
Passports for all accompanying family members must be submitted together.
There must be at least one blank page in your passport(s).
If there are children included in your passport, there must be blank pages for their visas as well.
The immigrant visa that is to be placed in your passport(s) will show an expiry date. You may enter Canada anytime before the expiry date shown on the visa. Please note this date cannot be extended. If you fail to enter Canada before this date, you will be required to reapply and submit a new application and processing fee.
Please note: Immigrant visas cannot be placed in Diplomatic, Official or Military passports.