Hubby now has me convinced that they weren't from a leak, but maybe fell off of some plastic box we brought into the house during one of the rains. However, we did then get a bone fide leak from our water heater. Hubby called a plumber who said it had been installed wrong. He did an interim fix and said to call him in any amount of liquid began to accumulate. Well, there's not really the leak on the floor, but some condensation on something or other. He'll call the plumber tomorrow morning. Hopefully he'll do something else then. After tomorrow he's gone for a fishing trip to Italy.