From Microsoft official document, I cannot find out a way to check whether there is an active autopilot on notebook without Intune.
Because all Autopilot documents tell us that Prerequisites are:
Intune subscription
Windows automatic enrollment enabled
Azure Active Directory Premium subscription
Or
Automatic registration of existing devices. You can automatically register an existing device if it's:
running a supported version of Windows 10 semi-annual channel
enrolled in an MDM service such an Intune.
The following document maybe the closest, but still needs Assigned Microsoft Intune Licenses
Windows Autopilot Deployment for existing devices
https://learn.microsoft.com/en-us/mem/autopilot/existing-devices
On the other hand, if you want a script method, you may take a chance on script forum
https://social.technet.microsoft.com/Forums/scriptcenter/en-US/home?forum=ITCG
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