I just got a reply 3 months after my test results were updated from my local office (Winnipeg) they asked me to get my Indian PCC as I was in India for over 183 days and asked me to apply for Foia notes to get details of all my entries to US.
I dont know what these cic officers do in life but they really need serious training and monitoring. i dont know what to say.
But you should have prepared for this ahead of cic asking on it as cic is never been proactive. foia takes months to deliver results - same like cic.
You should have sent the indian pcc along with application to avoid this last minute headache.
I dont know if you know but if you dont know then here is the tip:
Create account first before raising request at
https://foiaonline.gov/foiaonline/action/public/home
Dont request directly as i heard they dont provide full details.
Options would be customs and border protection as entity/agency and select entry-exit option.
Also include the reason why you need and correct duration(those 5 years).
Attach your front and last page of passports during that period and nexus copy if applicable.