i think you should leave behind everything at a private course with a staff and a lost and found. a public course, sure that is different.
Definatly never pick up plastic that isn't yours on a private course. The most I will do if I find plastic off in the woods on a private course is either take it to the lost and found (providing there is one) or place it somewhere in the shade where the owner of the course will find it. Unless it has a name and # on it, then I will call and text the person to try to get it back to them first.
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