"I'm willing to share." It's true that even with people willing to teach, he won't get much use out of most of these items, but if agreeing to share is what gets him to be able to use the harpoon, then he'll do it. As long as he gets to use it, that's what he cares about.

"Perhaps if we're going to do some sort of check out system, then instead of having to record it every time, we need some sort of symbol to put where each item goes. A trinket or something, unique to each person, so that we can see at a glance who has it." What that might be he doesn't know, but there are enough people here that someone must be able to figure it out.

"I won't get much use out of most of these, it's why I've been trading fish, but if someone wants lessons, I'll trade those instead." He does still have to think of his survival, after all. He's willing to work some things out, but there will likely be some areas where he won't budge.