where is the best map to find it ?!

Someone can say me what is the bestmap to find LF-4 ? :) thanx

i have 4 LF-4 Now , i get them from different maps

2 from X-8 Map
1 From X-5 Map
1 From X-7 Map

i guess not by certain map , it's Only Luck :)

Not on this maps there everywhere if you find it :P
500 Booty keys= 35 Drohnenbaupläne,5 lf4,12 XL tarn cpus..

its just luck