We received two Certified Like New replacement Droid2s from VZW to solve an ongoing screen freeze problem with our originals. Activated the replacements, and we are supposed to send the originals back within five days. After activating the replacements, I did a Factory Reset on the originals in hopes of removing any passwords that may be visible. Can I be sure these original D2s are clean? I really don't want to go through the ordeal of changing passwords again. Thanks for any insight.