Activation Lock Check
Verify Find My Mac status before purchase
Bottom lineNever buy a Mac with Activation Lock still on—it is unusable without the previous owner's Apple Account. Check System Settings > [name] > iCloud > Find My Mac is off, have the seller erase the Mac with Erase All Content and Settings, and confirm that setup does not ask for the previous owner's password.
Check Find My Mac Status
System Settings > your name > iCloud > See All or Show More Apps > Find My Mac. Confirm the seller can turn it off
Ask the Seller to Remove It Properly
Have the seller turn off Find My or erase the Mac with Erase All Content and Settings so Activation Lock is removed from their Apple Account
Verify the Mac Is No Longer Linked
After removal, the Mac should no longer show the previous owner's Apple Account in settings
Confirm After Erase or Setup
After erase, continue to setup. If the Mac asks for the previous owner's Apple Account password, Activation Lock is still enabled
Critical: NEVER purchase a Mac with activation lock still enabled. The device will be unusable if the original owner's Apple ID is not removed.