Each week recently, we have been leaving Sunday night after Wolly finishes work, camping out (in our swag) and then getting up early Monday and caching all day, getting back home late Monday night. This cache is placed nearby one of our camping locations. It's off the highway a little, but there is an access road - either from the highway or from the parking bay nearby.
If your camping there, there are no toilet faciliites (except the bush!) and it does get quite cold overnight especially in the winter, so bring an extra blanket. You can see remnants of previous campers having a campfire (not us!) Don't forget to take any rubbish you make with you!
You are looking for a mint tin.