I agree the rules (like pretty much everything in adult life) is ambiguous and open to personal interpretation. For what it's worth, and without knowing anything more about these 4 caches than what was posted above, at least 2 of them do seem contrary to how I interpret the published guidelines, being "Thewellwashere" and "Shelter From The Storm". The thing would stop me from placing a hide like that (well, apart from lacking the imagination and skill required) is I probably couldn't bring myself to make a permanent alteration of a physical object without the owners permission (I assume "Melaluka Park" could be 'undone' by replacing the original knot, and you had permission to make the changes in "Take me Out to the Ball Game").