Had the same thing last week. Nothing like swimming around in wet mulch.I dodged my hardest one. A customer called for an exterior GFCI
receptacle that wasn't working. Sounded easy. Before I went, he called back. His wife had reminded him that the exterior receptacle was controlled by a light switch in the house (something they thought they needed when they built the house, in case they wanted to turn christmas lights on and off).
I don't know how long it would have taken, but there sure would have been a lot of other boxes & etc. took apart before I would have started checking light switches.
(Oh, There's a switch)
Took me 45 mins.