What does it mean when I have dropping in my mock scrape? What about new scrapes or rubs too?

Congratulations on finding chemistry that works on wild deer. Droppings in your synthetic scrape is a huge bonus. Deer responding positively will often urinate, leave droppings, and/or scent communicate on your licking branch. In addition they sometimes increase their scent marking by making new scrapes and/or rubs in the area. As long as deer don’t move out of the area for new food, better cover, or because of heavy pressure, this location should pay good dividends.