""How to find your Original form asset on Hard Drive""
Unity can not track your asset when it is an original from the asset store. Do not load and save in the hope to cloack yourself. It is easier for Unity to hide some tracking information when you save, than when you download it from Amazon server.
***How to find your Original form asset on your Hard Drive***
It is located at:
For Unity 4.x C:\user\yourname\appdata\roaming\unity\Asset Store\authorname\category\ on PC
For Unity5.x C:\user\yourname\appdata\roaming\unity\Asset Store-5.x\authorname\category\ on PC
and ~/Library/Unity/Asset Store on MAC