I have a couple preactivated accounts for AdWords and I understand that you must use a proxy so that Google doesn't recognize multiple accounts. How would I go about doing this? I have tried ProxySwitch for FireFox, but the proxies don't last more than 5 hours.
I once had a very good one. I remember I used it to help a friend for a voting contest: 'Try to get as many votes as possible and everyone can only vote once a day' He won As soon as I remember the name I'll get back to you.
But why would you want to hide those pre-activated accounts. I think it is fine and allowed, If the accounts are genuine.
Just use the option "Cancel account" to cancel the accounts that you are not using anymore. I got few account as well, but only one is active, and the rest are cancelled.