Thats funny.
I never ever heard of cashtrades that are done like that.
To meet, pay a deposit and receive a paper...
...buyer has to trust to someone unknown.
The reputation that your partners maybe have says nothing to the buyer.
If anyone asks for a deposit before cashtrade, then its only to cover the cost of travel to the meeting BEFORE the meeting, and of reasonable amount(g.e.300Euros) but never ever at the meeting.
Well even that kind of deposit is not very common...
100% of all cashtrades are done without your senseless and dangerous(for the buyer) deposit.