I saw this rumor on Reddit, which refers to factsanddetails.com and which doesn't indicate the information source. I saw a video of a monkey using a vending machine on College Humor, but that doesn't say whether monkeys have actually started stealing purses or wallets.
Specifically, the claim is:
Monkeys in Mino near Osaka have learned to steal purses and wallets and take out the coins use them to buy drinks and snacks from vending machines.
Is this true?