Your odds of having your wallet returned to you in Japan are very high. Your odds of this happening in Canada depends on your area. In my area, odds are decently good. In large cities, probably not.
People in Japan are polite, but not honest. By that I mean they'll smile in your face (tatemae), but talk shit behind your back. So if that counts as untrustworthiness, that would be points docked. They're like this for everything. They tolerate people like homosexuals, people with tattoos, toasted foreigners (i.e. brown to black spectrum), meaning they'll never say anything bad to you because they're deathly afraid of confrontation, but they'll be sending death glares your way whenever you say or do or are something they don't like, on top of talking mad shit about you in private. They're cold people.