It is always best to submit with a password since I'm not the only one who does the reviews. Plus some AVS services your webmaster password only works on your own sites. That is how CyberAge worked on their premium sites, not sure what other AVS do case by case. RIP CyberAge.
If I remember with SitePass it is your ID plus a letter or something. I can't remember since I don't submit my AVS stuff anyplace other then my own lists.