According to EL, F parts were looted:
Foot x 8
Shin x 12
Thigh x 13
Harness x 11
Arm x 3
Gloves x 4
Helmet x 10
So up to 3 sets can exist currently, and the possibility for the 4th from current gold rush, if winner of that prize is F avatar (idk if winner choose as he wish or based on winner avatar)