Griff was being pulled towards dock one with not much resistance, he went along with it, He didn't know if Sammy used his cunning to fool those marines or if he was just that dense, probably the later, but it didn't matter, they were near a ship and all they needed was to get out of the island as soon as possible without attracting too much attention. 
Arriving at dock one, there was a few ships for sale, they weren't grand ships or a battle ready ships, but one had a grand feel to it. Next to the ships was an old man, he sat next to one ship, stacked next to him were barrels of fish, booze and water, boxes of what appeared to be meat, a fishing rod, and a map, the old man had dossed of looking at the map and was drooling over it. Griff took the initiative, told Sammy to play along and gently pushed the old man to the side trying to wake him up.
Old man: WHASAT, HUH? Oh, it's just kids, stop messing around and go bother someone else will ya.
Griff: Sir, how much are the ships? 
Old man: Stop messing around you can't possibly afford any of these ships, go suck on your moms tit and stop bothering me will ya
Griff kept his cool, negotiating was something he had trained in, he opened one of his briefcase and took out a gold watch and a bag of gold. 
Griff: Sorry sir but I'm not any young man you see, this is some of the money I'm prepared to offer for one of the ships, you see this man behind me is a VIP, we were attacked by pirates, and this is almost all we could salvage from our previous ship, now those very pirates are in this town, looking for us so we need an ordinary ship to travel in a more conspicuous way, same reason we look like commoners. If you sell us a ship and some supplies, we’ll make sure you are rewarded later.
The old man couldn't believe his eyes, the gold clock was made completely out of solid gold, and two bags of more gold were next it, filled to the brim. The man was too happy to even think straight, the story the young man told him made some sense and he heard there was a commotion in town, probably pirates, so he just took the money
Old man: Of course young man, this will do for the ship alone but, the provisions are an extra, these are all my day’s catch you see so … *the man said with a greedy face*
Griff: “But of course good sir, here, this is all we have, will it be enough?” *Griff took out another bag, this one had jewels at the top and some gold coins.
The old man took it and stashed it away in his left pocket. 
Griff approached Sammy and whispered to him
Griff: “Captain, as your first crewmember I present you with, any ship you like, I think the first ship of the next pirate king shouldn’t be stolen”
Griff went next to the old man, his right, and began moving the boxes close to the ships.

Meanwhile
the marines looked at the two boys and saw the straw hat on Sammy, 
Marine 1: “you don’t suppose those kids are the pirates they were talking about….”
Marine 2: ”There aren’t any people who use straw hats in this island, so it’s very likely…”
Marine 1: “I’ll go check on what they’re doing, I’ll signal you if they do anything weird”