questionscan you track the location where eye-fi cards…

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Eye-Fi servers record the IP address in their logs. IP addresses can be traced backwards, to some limited degree.

First step is to contact the Eye-Fi customer service folks and see what they can tell you. Depending on what they will reveal, you can do records search for the IP owner, contact that provider and see what they will do.

If the camera is reported stolen, it is possible for law enforcement to compel the release of IP assignment at the time of the upload. That gives a starting point.