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I think the two floating bolder, type things you said they had no use, if you push the bottom one to the end, you can go through the gap and there is a hidden item there or something.
At least that is what I think I remember.
Should of guessed there was a use for them as I guess it is silly to have them with no purpose, had a check and turned out it was an Iron, guess it could turn out useful for selling if I don't use it. already recorded the next part so may end up not getting it though, depends if I remember xD