"Can you tell me your landing details?
"
Just fly or drive to Canada. Just a piece of cake. Nothing to worry.
"How did you come back in the two days without maple card."
The maple card is your Canadian PR card. You don't need a maple card to come back to US. Just land in Canada, then give them the mailing address in Canada and the Canadian government agency will mail the maple card to your address in Canada. You can use your friend's address in Canada. They sent the maple card to my Canadian friend's address 20 days after I did my landing.
It's a very easy process. Nothing to worry.