Hello, Paul Valente2.
Welcome to Microsoft Community!
From your description, it appears that you have lost your Surface Go 2 and when it is located via the Find Device feature, it can only be pinpointed to when it was used last week.
Find and lock a lost Windows device - Microsoft Support
Typically, the locate function is related to the device's activity log. Network activity, power-up activity will all affect the final localization of the device.
If your device is shut down (Battery drained) or reset by a bad guy, this will also cause the lookup to fail.
Losing your device is always frustrating and I can understand your concern at this point. But you are still able to protect your information from being compromised with the ability to lock your device.

It would be better to contact the police to further try to recover the loss of your property after keeping your information secure.
I hope you stay safe.
Best Regards.
Leo.L - Microsoft Community Support Specialist