I don't understand the problem in finding these, they are the most common wake data - I fill up with these in no time outside stations. DWE now they are a pain with the dearth of famine states so I just trade data from Jameson's Cobra or the Bug Killer.
The wake scanner doesn't work and someone in my group told me to scan a crashed ship, but I also didn't get anything there. These engineers are really ****ing me off.
If your wake scanner isn't working you need to check a few things - correct HUD mode, fire group assigned, hardpoints extended, power OK in the modules tab and finally be within the range of the grade of scanner you have fitted.
Scanning the comms points at Jameson's Cobra or the Bug Killer wreckage gives you high grade data which you can trade for wake stuff at a correct type of material trader.