You can usually find the downloaded package (push from Casper JSS to Macbook) at /Library/Application Support/JAMF/Downloads

Please note the Downloads folder is set a read-only by default. You may go to Get Info > Sharing & Permissions > Set everyone = Read & Write. You do need to unlock the padlock with an adminstrator's password.

Hope that helps.

Apple downloads updates to /Library/Updates/

The Casper Suite caches packages to /Library/Application Support/JAMF/Waiting Room/

There is a discussion about the Apple automatic download of the Sierra installer here: https://jamfnation.jamfsoftware.com/discussion.html?id=21511

Sorry, looking for a smart group to do this.....if it's possible.

When I last posted, I haven't yet understood Apple's strategy.

The item being automatically downloaded is /Applications/Install macOS Sierra.app

@mrice noted the package below delivered via softwareupdate

If you want to identify those computers with the installer then you can base your smart group on the presence of that application. If you want to specifically know which ones automatically downloaded it you could look for the package.