Reporting without chat log?

I have a small problem. I was scammed out of 73 keys, when I went first, and they promised paypal payment. They seemed legit, as they had several hundred dollar's worth of items in their inventory, and they still do. However, in the midst of things, I forgot to record most of the chat log. I have my inventory and paypal history, is that enough?

problem for us is that it could have been for bitcoin, or webmoney or other ways of transaction. the 3 parts complete the puzzle:
- Trade agreement, and by what means the payment would be.
- Inventory history
- non-payment history in the agreed payment system.

without these "keys" they can point to any "payment" and say it was for that. you can report anyways, and the report will be noted on their profile for as long as its not archived.

Ok, I have the latter half of the agreement, but I decided to record it via fraps. I will try to open up the video, and take a screencap of that.