I would assume the GPS tracker is part of their hand held scanner. Wherever that scanner is when it scans the barcode and marks the package as 'delivered', then that is the GPS location.
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Working Sets:
Baseball-
T206 SLers - Virginia League (-1)
1952 Topps - low numbers (-1)
1953 Topps (-91)
1954 Bowman (-3)
1964 Topps Giants auto'd (-2)
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