Using the Same Variable, Recycling Behavior, Provide an Example for an Indirect

Using the same variable, recycling behavior, provide an example for an indirect measurement of recycling and an unobtrusive (but not indirect) measurement of recycling. In your response, be sure to explain how and why your examples are unobtrusive and indirect measures.
Indirect measure of recycling: two potential trays of paper could be made available to participants (e.g., for scratch paper). One tray is full of paper with obvious marks on the top of each sheet, but much of the paper is still usable (e.g., labeled something like "scratch paper"), and the paper is slightly less bright; while the other tray is filled with obviously fresh, untouched paper of a brighter and whiter hue. Choice of scratch paper to use would be an indirect measure of people's commitment to reducing their consumption and recycling material when possible.
Unobtrusive measure of recycling: offering people a free water bottle, and recording whether they put that bottle in the recycling or in the trash.