You want to print these out in hard copy just to be safe:
1)
The original email offer. This is the offer originally emailed out, which includes the original T&C, code, offer, etc. There is no language about Expedia being able to cancel at any time in the original offer. Note that this original PDF shows "per booking" where as now it's "per person", so for all of you who have multiple bookings under your name, you will need to rely on this.
2)
Your expedia itinerary
3)
Expedia Charges. Log into your expedia.ca itinerary and click on "My Payment History". This will show the transactional history on charges. Print this out.
4)
Airline Itinerary. Log into your airline (such as JetBlue) with the confirmation code, and print out the intinerary.
5)
Airline Receipt/Payment. On JetBlue, when you click View Itinerary, there's one more link called "View eTicket Receipt". Mine showed some taxes, with final amount zero'd out. Print that out.
6)
Your credit card transactions. This will include charges and refunds from Expedia.
7)
Hotel confirmation. Call your hotel and confirm. Then have them email you the confirmation.
Hope that helps.