How to get IMEI from broken screen?

Me to. I need to get the IMEI of my friends phone (for his warranty repairs)

- phone in question OnePluss 3T
- screen is black
- USB-debugging is off
- phone had a pass-pattern (which is known)
- not-rooted
- stock-recovery
- google.com/dashboard doesn't show IMEI for devices which are not active
- google.support doesn't have an email
- carrier refuses to name the IMEI
- police wont help
- to enter fastboot in stock recovery you need to see what you're doing
- phone was bought on ebay - and...

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