There are three things to find. I don't understand how you had difficulties finding them. Just drive around the lighthouse with your lights out.
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They didn't say they couldn't find three things, they said "it appeared to me that there were plenty more things to find". Feeling like there might be many things is utterly different than "I can't find anything!" Learn to read; if you don't bother to listen to what people actually say, then you will create unnecessary problems every single time you (mis-)communicate with other humans.