Those game and watch devices are toast.
Is that a bunch of external hard drives stacked up in one picture?
I keep a lot of my stuff in plastic storage bins. If I was going to be flooded I could seal the bins with duct tape and stack them up high somewhere.
if toasted there is always pepole that are looking for spare parts, so not all is 100% lost here.. and as told before if he try the stuff it may also be working at least the game cardridges,gamecds,game controllers etc.