This is an idea, but it's also totally a workaround, so, you need to remember that fact. Adobe has a tool to check for expiring volume serial numbers called "AdobeExpiryCheck". The tool could be used as a way to eliminate which machines have the volume or retail serial numbers as the machines with a retail number would register with the following message:
"No expiring/expired serial number found on the system."
Again, this is a workaround idea.