Replacing generic RECEPTACLES

I get that the Blu Tack is only on the backside, that's where I want to use damping material. 
So, I intend to stop vibration at the receptacles, but do you believe that this area also needs treatment for RFI?

I'm not going buy carbon fiber treated covers, but I'm still looking for an explanation of how RF can be generated or exist at the AC receptacle.
 

Thanks so much, Elizabeth, terrific explanation. Now it makes sense why you have the quartz crystals in different areas, and why so many tweaks are for sale to treat these same areas.
  I was aware of possible RFI being found in the obvious areas such as unshielded AC cable and transformers. The Crystals and similar tweaks to be used system-wide seemed unnecessary to me.
The Greenlee tool could be useful.
Thanks again.

It’s a common misconception that crystals generally operate by absorbing RFI/EMI. In fact, crystals operate in most audio applications by absorbing vibration. For example, in room corners, in proximity to ekectron tubes, on output transformers, on top of tube traps, and on cable connectors, wall outlets and windows. The only good vibration is a bad vibration. Having said all that I wouldn’t be very surprised if someone somewhere could find a place where crystals improved the sound by absorbing RFI/EMI.