1: don't trust anybody, especially thiefs!
2: keep your base protected. Have a fading door and keypad.
3: don't have your base obvious
4: don't make it look like there are printers in your base.
5: Do Not make your base flashy(no KOS signs)
6: have your base in a building that has lots of doors
7: only own one of the doors in the building
8: make the front entrance look like there is no one in there
Hope this helped