You may want to email your local visa office with as many elements of information that you can remember for your previous WP application, such as your name, date of birth, place you applied from, passport number at that time, type of visa, etc etc..... and request the visa office to give your UCI Number and File Number for that WP application.
You may get either response:
1. The visa office will give you the details you need, or
2. The visa office may respond to say that there was no previous application. If this is the case then it would clear the uncertainty and consequently, any doubts about misrepresentation committed.
No, you cannot.
If the agent had applied, you would want BOTH.
Yes, you would be applying for GCMS notes for a Temporary Visa