I wonder how many "easter eggs" were planted by people on the NSA's payroll pre-2005? One of the lesser talked about things that was touched on in the Snowden

I wonder how many "easter eggs" were planted by people on the NSA's payroll pre-2005? One of the lesser talked about things that was touched on in the Snowden docs is that the NSA sometimes has agents within companies similar to how we traditionally think of the CIA having "assets"