No, they did not threaten you or asked for money upfront, they just took your papers and disappeared while one of them remained next to your car. He might then sigh and say "It's a hot day". If you offer him some money "to buy something cold to drink" then he'd signal to the others and your papers will be back immediately allowing you to proceed with your journey. if you ignored him, the papers check would last the better part of 30 minutes before you are allowed to go. It's your call....
Personally, my issue was more to do with their cavalier attitude towards firearms.....