How Can I Track DVRs / NVRs With a Service Tag?

Hello, does anyone have a good solution for tracking hardware?
I am looking for some type of labeling system where we could put a label on each DVR or NVR with a customer number on it...

Like a DELL service tag...

Then we could easily look up that device in the software and see what service has been done to it, who the customer is, etc etc.

Any ideas on this?

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