Teamviewer returning same ID after re-format of Macbook Air - Identity theft?

I'm in a serious situation here. So I basically sold my Macbook Air a few days ago via a third party vendor who erased the hard disk and re-installed the OS from scratch before paying me the requisite amount.

However after a few days, I see the very same Macbook online on my Teamviewer trusted computer list. Is it possible that the teamviewer ID remains the same even after formatting the whole system?

Or is it a case of the format not having gone correctly, and consequently the files that i left behind being accessible to the person who is using the computer? Please suggest.

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