What you need to do now is relax and focus in your test/interview.
If you don't have the itineraries, you don't. Don't sweat over that.
I know there are some cases of the Officer demanding more proof about the travels, but consider these points:
- Many people with several trips, during the interview, had the Officer already holding their CBSA report (requested by CIC prior the interview). That happens when the person has a lot of travels and the Officers just want to confirm the exits and entrances.
- Many, MANY people had several travels AND missing stamps in the passports AND no CBSA report or anything. And nonetheless the Officer didn't even ask any questions bout it.
- Worst case scenario for you is: The officer wants further proof of your travels, you don't have it, he doesn't have it, you will be RQd, you request a CBSA report (takes 30 days) and send to CIC. It kind of sucks, I know. But your application will be still valid and running.
I myself, had two stamps missing on my passports. Granted that I didn't travel much and the stamps missing were from USA, but they are missing stamps nevertheless. I didn't have any proof of these travels. The Officer never asked.
I wish you luck and peace of mind to go through your process tomorrow.
If you can't do anything right now, the best you can do is relax and focus in what you CAN do: score 20/20 in the test and be very friendly during your interview.
The Officers are nice people. They are understanding and helpful.
Please keep us posted about your case after your interview.