Sounds like your floor plan is similar to ours. We have had 2 times that water could have gotten under the frig and cabinets. Didn't discover the first until we were out from under trees and refrigerator roof vent was totally exposed to heavy rain -- it leaked filling the outside compartment, then running inside under frig and cabinets until carpet in front of frig was wet and we discovered it.
The other was a hot water connection on the water heater. In lower cabinet next to frig. Floor there got saturated and then leaked either direction and was under the frig and into bathroom floor and on into bedroom. All from a drip that until things were sopping wet was not bad enough for us to hear or know was leaking.
You will want to know where it was leaking unless you can definitely tell it is from an old no longer active leak.