My freezer went without power for 70 hours while we were out of town. The power was restored before we returned and refroze everything. The unit was full and did have some solid ice packs within. Is anything safe to consume in this freezer?
If this was an upright freezer with cooling coils in the shelves, there was frost on the shelves before your trip, and after you came back there was still frost on the shelves, then you can intuit that things never got above freezing. Otherwise, there's almost nothing you could be sure of, except perhaps by pulling the plug, waiting 70 hours, and then testing the temperature.