Each of the caches nearby named "TSPTOB" are part of the mystery cache "The Sunny Port Town Of Barnsley". You do not need to do the mystery cache to be able to find the indiviual caches, these can be done as standalones if you wish.
Tweezers required.
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Looking at your initiation scroll it looks like the captain wants you to get him a snack. He won't admit it himself, but he's a little short even with step stool provided - maybe you can help?
Good luck pirates!