No there is RAM located in the 2 slots in the middle of the motherboard (both are used) and there is 2 slots on the left hand side of the motherboard (of which 1 is free).
As for the Command-Opt-P-R trick", sorry if im being a bit thick here but if thats a keyboard input then im not sure were them keys are.
Forgot all about the 'breaking glass' (no RAM/hardware fault) vs. 'happy ding' sound - again, how much did that add to the cost back when singing greeting cards cost $20?

That power toggle trick was a similar concept. A little Googling confirms the battery is a replaceable lithium, so you won't have to worry about leaks but might want to find a replacement if it forces you to do this dance every time you want to boot it.
Now that you've proved it wasn't gutted, you probably want to see if you can find the Apple System Profiler somewhere on it and check whether it's bone stock or already has some sort of CPU upgrade. Though that might be hard to miss on those models, if you've opened it to check the RAM.