Now that it has been cleared up by OFG and VG that the swim fins and Hawaii'n sling were on the truck, they can't be part of the reward episode 3.
It is still possible that the snorkel and mask are part of the reward.
(hanging on stick bottom right)
I personally can't find them pre episode 3 but that does blow my theory that the women trade the fins for fire. I still like to think that they did win and use the reward to barter, but with nothing left to back that up I have to say it's just speculation on my part.