Powershell - ADGroup list AuthOrig

Experts,
I am brand new to powershell.. pls bare with me.

I have an ADGroup (mail group) called  '3-Everyone'. I have restrictions to who can author in this group
I add in authorized authors using this

Set-ADGroup -Identity "3-Everyone" -Add @{authOrig="CN=Mike Moore,OU=Users,OU=AB Smith,DC=absmith,DC=com"}

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I am trying to use powershell to list back the 'authOrig' approved users but not having any luck