Private mail me your name, email and company information and i can look up your licensing information.
My guess is you started with an extranet account for an evaluation and purchased afterwards. It is likely a new extranet account was created for the purchase and you don't have the logon information. I can look that up.
Email me at Erik_Elsasser@McAfee.com
the activation will provide you with an evaluation license only. The idea of this temporary license is that you can start working while you are waiting for your final (purchased) license.
I would like also to ask if where do McAfee counts its license usage as used liI know that it is per seat but what is the basis, is it per ip address? per account?.
This is a question, I would encourage you to ask your reseller or McAfee account representative as it can be contract dependant. The definition could be bound to the contract between McAfee/the reseller and your organization and therefore might be a trade secret.
Furthermore, I encourage you to read the EULA, which is linked from the product's UI. It clarifies this topic in sections 2 and 3 generally.