I found one 10 peso paper currency, one one thousand peso currency and 2 one hundred thousand peso currency. Are they worth anything?

Look on EBay for "Japanese overprint currency". Some go for $1, some for more.

Normally not more than 20 or 30 dollars each, often only 1 or 2 dollars each. I have a box full my dad got during the war. It makes a nice wall hanging, or history to show local kids.