I do believe that the receipt Newegg provides is sufficient. I am looking at one as I write this. It has an Invoice number, an order number, the order date, the invoice date, item number(s), description (complete with serial numbers), quantity, unit price, extended price, subtotal, tax, shipping, and Amount Paid.
In addition, it clearly shows Billing Information and Shipping Information. I have to say that this is one of the clearest, most informative receipts that I have ever looked at.
I cannot, of course, guarantee that this is sufficient for the purposes of this rebate. (There are few guarantees in life.) But I believe that it is, and I would have no trouble risking $10 on it.
As I stated in my first post in this thread, Newegg is not going to keep giving the $10 discount. And the message from ctg08 clearly indicates that I was correct, they are not giving the $10 discount.
There is nothing to prevent you from calling and asking for the $10 discount, but don't be surprised if you are refused. One of the problems (from the vendors viewpoint) is that if they give you the $10 discount, what is to prevent you from applying for the $10 rebate as well?