I have been testing in beta, I found out that if you do 9 times with premium on normal job of picking berries, you would get them at least only two.
After the three bouqets, you can go for the other 7 in any other job.
The first three are only in picking berries.
I tried in beta a silver job(picking oranges 2 min) and a gold job(shining shoes 1.5 min)
Neither gave because I didn't finish from picking berries of 3 bouqets.
So far I have found 8 bouquets. All whilst doing 30 minute jobs (Drilling for oil (3 bouquets), Building windmills (2 bouquets), Building coffins (1 bouquet), Plant trees (1 bouquet) and Iron mining (1 bouquet)
It would appear therefore that the first three are not only picking berries. I actually gave up on that after so many unsuccessful attempts