[Devils'Advocate]

After we in Ontario had our blackout a few years back, where our power was out for a prolonged period, the local news radio station brought in health experts to answer these types of questions. Anything that you buy at the supermarket off the regular shelves (mustard, pickles, soy sauce) should be fine. Things you find in the cooler section like butter should probably go. Except yogurt. Yogurt and cheese should last longer than meat. Unless you see visible mold, it should be safe to eat.

The best thing was that for the evacuated people was that they were away while the power was off. Here people were opening and closing the fridge repeatedly while the power was out, letting all the cold air escape and letting warm air in. So while your fridge may have been without power for four days, it wouldn't have reached room temperature until a few days later. So the health expert on the radio said that if you had been opening the fridge throughout the blackout, you should err on the side of caution. If the fridge had not been opened until the power came back on, you can be a little more lax.