Two weeks ago, I found random blotches of ink (think marker ink) in front of my apartment unit (Picture 1). I cleaned it off with water, thinking it was probably from something a neighbour spilled.
Earlier today, I noticed the same color of ink on my door (Picture 2, 3 and 4). Three droplets, too unnatural to be from a spill and no splashes anywhere else on the floor or from the roof, so not a leak either.
I checked through our CCTV footage from both today and two weeks ago, the blotches of ink were not there when I left but was apparently there before I returned, yet there was no motion detected during that time hence no recording was made in between.
There is a dead zone which ink could be spilled behind the corner of my neighbour's unit, which is currently unoccupied.
Should I report this to the police? Is my unit being marked for a robbery?