I've never had experiences with these subtle orbs, but a pendulum, if you don't have one already, could help decipher them.
The only time I've been open to seeing these types of energies was when I was blasted on LSD. I could see people's auras. I could see if they were angry or if they were sad. It was almost too much. Certain people who were angry just spewed weird reds and sometimes you couldn't even see their face, it would just be crushed with colors denoting anger. Very repelling.
And as always, use incense and smells (Guild oils) alongside your investigation. Better safe than sorry.