Several years ago, my son had a similar issue. I'm not sure if this will still work, but it might be worth a try:
1. Go to: I FORGOT MY ELI ACCOUNT ID: https://fidelis.its.yale.edu/authent...li-accounts.do
2. Enter your son's email address of record on his application and press continue.
3. Your son should receive his Eli Account ID by email. (Check junk mail foider.)
4. Once you have the ID, go to I FORGOT MY ELI ACCOUNT PASSWORD: https://fidelis.its.yale.edu/authent...li-accounts.do
5. Enter your Eli Account ID and press continue.
6. Your son should receive another email with his password.
7. Once you have the Eli account ID and password, go to ELI ACCOUNT SIGN IN: https://secure2.its.yale.edu/acas-ea...enticate_altid