There is quite a lot of good coverage on Skeptics already of the security of RFID and contactless credit/debit cards, but it mainly focusses on card cloning and identity protection/privacy/tracking issues.
However another issue which you see a certain amount of public paranoia about is whether people with contactless POS sale terminals could be simply wandering the streets helping themselves to small amounts (below PIN verification threshold) from unprotected cards in people's back pockets, handbags or whatever. (This is sometimes described as "electronic pickpocketing", which is somewhat confusing as the term seems to also used for the identity-theft variety of information skimming too).
http://metro.co.uk/2016/02/17/use-a-contactless-bank-card-watch-out-for-thieves-bumping-against-you-on-trains-5700472/ (that widely circulated picture debunked at http://www.snopes.com/fraud/identity/pickpocket.asp ).
https://www.lifehacker.com.au/2017/01/ask-lh-do-rfid-blockers-actually-do-anything includes "Could people just carry around an EFTPOS machine set to tap $99 straight out of your pocket?" (That's Australian dollars).
However, I note that the marketing around RFID-proof wallets generally seems to emphasise protection against identity theft rather than protection against this more direct sort of monetary theft.
My question is simply: has there ever been any documented instances of anyone actually doing this sort of electronic monetary pickpocketing for real criminal profit? (A link to a record of a successful prosecution would be pretty convincing).