Thanks for the concerns guys and based on your feedback, yes probably it would have been worth reporting it to the park. But only as an FYI to put in file is my thoughts so that it is recorded if they ever come back.
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relgate no I did not see them actually doing it. I am purely basing my opinions on that first day when setting up and they arrived from wherever they were for the day. From their end they saw this massive lumbering van completely overshadowing their camper trailer. Morning sun completely gone for them. But that was the site I was given and it was just big enough for my van. So not much I could do. But it did not change the cold reception I received when they rolled up. That's the basis of why I am pegging this on them and also why I am happy to share my comments with all of you, but in reality I can't accuse someone of something formally without hard evidence.
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Soaring, thanks for that visual and whilst I feel whoever did this probably would have had a small enough appendage to insert it into the filler hole, I am going to assume that one was overlooked.