unimogbert is describing a "blood chit"...a guarantee by an outside party that one who helps or gives aid will be rewarded with a stated amount of payment (typically gold)...the grantor typically issues a document written in the local language(s) with a several numbered chits attached... which are dispensed by the injured party.... that chit is only paid upon the successful return of the injured party... in 1972 the US Airman's chit was worth about $50,000 in gold...a 1/10oz gold coin would easily fit in the bottom of a pill fob, and could probably cut if necessary by a multi tool... in Thailand the bar girls typically had their "di di mao" money in the form of "baht bracelet" jewelry with the charms an accepted weight of gold.. the Christians In Action could usually be identified by a gold Rolex with black bezel and heavy ID tag gold bracelet, that allowed you to remove one link at a time.... sounds like a good idea if you are willing and it is used discretely