Reinstall with our S/N or activation number

Audio geek friends: Our Pro Tools computer bit the dust. I have to rebuild the machine and have a question about re-installing PT 7.4: I have the iLok dongle, but can't find the activation code and/or S/N of our PT license, and we're usually really good about tracking that stuff. Can I download Pro Tools and will it become activated based on the iLock being present? I have PT10 at my other office and it came with an activation code. IM me if you can help. Thanks!