If you have a test light you can test 'em by grounding the light, and test the little metal prong on the top of the fuse. if both sides don't make it light then it's a blown fuse.
I'd dry them out take a picture of their placement first, and steal the girl's hair dryer. (duh, you posted a picture...drool)
No problem..Ya big thilly
The black relays SHOULD be sealed but ya never know. The mini fuses are probably okay. The pinkish/yellow ones have a clear top that you should be able to see the lead connector. Visually inspect them for a break through the clear top.
I'd mainly be worried about water inside of it.
The grey plastic locking clip on the left of the photo (wire harness) might have to be released to remove the box and get all the water out. If you look at it you'll see the "C: groove in the catch and slide the clip that way to release it.
Just because we're the class clown doesn't mean we weren't listening
Oh yeah...that yellow gizmo is the fuse puller. One side for the mini fuses, the other for the 20/30 amp pink/yellow.
Read the diagram on the inside cover and see if there's a main. The turn signal could be water in the box, but check which fuse/relay controls it.
I'm going to open chat in the background in case you need anything else.