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Look at the usernames. Dig on those accounts. Make a throwaway ig if you have to. some tools below i have found useful in making ig accounts.
https://smsreceivefree.com/
https://sms24.me/numbers
unlimited aliases to a single gmail account (dot trick) --> https://generator.email/blog/gmail-generator
Apparently you Gotta be logged in on the instagram.com site to dig. Not sure if 3rd party web viewers like tofo.me still work.