Should the maple leaf card for a family of three be sent at the same time? Did the Immigration Bureau send 1 email or 3 emails?

Hello, Canadian maple leaf cards are sent separately even if they belong to the same family. You sent it in May, which proves that your family had no problems during the trial and passed it smoothly. At present, the biggest problem should be the address responsible for receiving maple leaf cards.

I suggest you contact the delivery address as soon as possible to confirm the receipt of the maple leaf card. The probability of losing letters in Canada post office is very low. Please ask your friend to look for it. If you can't, you can only call the immigration office to see if there is any chance to reissue it. Good luck.