I bet this is right. There are some of those types of fasteners that hold the plastic covers in place under there.Looks like hair spring for a cam-loc type fastener.. ie, cabin filter housing-lid. Can't figure how it got under the gas pedal, but maybe it's got something to do with the water on your floor.
Let us know what you find out about the leak. I've had some water on recent occasions and I'm still trying to figure out how it's coming in. :dunno:Not that I've found yet, brake lights work, gas pedal feels normal. There was a lot of water on the floor mat after last night's rain so it looks like I'll be hunting for leaks as well as the home for that spring.