All of my blueberry were male as well so i kept their pollen and bred it with ppp and it came out great.
I get a high ratio of females with it as well after i crossed it into ppp.
Last time i grew them only a few months ago i didn't even have one male and i was gutted as i want and need a male now to inbreed them with again to make some more seeds to store as i have crossed them again now with a sativa.
Hopefully this time i will get a male
You should have saved those balls,if you see any more balls try to let it live as long as you can until the balls get droopy then pull it out of your area and box it up and seal it and leave it to dry up.
Carefully remove it when its dried up and put the male buds in a box to collect their pollen