Oddly enough, I too have tried a Virtual Gravity Nano that should have been soaked with oil. I know the user doesn't clean it after using and has used it for years.
Baked it in the NuBall at 135 for an hour and it came out dry. I hit it with a 500 beforehand.
I am finding, for me, that I am only getting oil out of newer and polished balls. I've had the nuball for 2 months and done over 10 balls for friends. Balls that I know are older and not cleaned that I thought would give me enough oil to fry chicken with, have come out dry. Same thing for newer solid covers, I have yet to get one to bleed oil.. Yet my newer stuff ie a Code Black, that I clean after every set, came out with oil on the surface. Baked it twice and it still had oil.