On the driver's side there is on by the PCV valve, one between the two rear bolts, and one built into the thread bosses between the front bolts.
On the passenger side there is one between the two front bolts and one between the two rear bolts.
I usually pry on the one by the PCV valve gently and the intake pops right off.
Didn't realize that. I'll check out my manifold and see where you're talking about.
Don't feel bad, I was working on them for almost two years before I realized. It's just nice to use them because it provides more leverage, so you use less force and have less risk of damaging any gasket surface.