For the first wave, 1 of the 4 possible objective at the center will be choosen whith also it's symetrical. There is also one objective (and it's symetrical) that will be choose among all possible objective exept those at the center. All objectives spawn in the same time, so if you followed, there will be 4 objectives at the same times.



The second wave is the same as the first, exept that it can't be objective that already have been choosen at the first wave (if you followed, you know exactly which will be choosen at the center for the second wave, because on 4 two have been used, so only 2 remains).



The third wave is different. Again, one will be choosen at the center with also it's symetrical. And one (and only one !) will be choosen among the objective near top lane and the objective near bottom lane.





For each wave, you will have 1min30 to get objective, if you don't get it, it dissapear. There is a delay of 1min30 after all objective got taken before the next wave.



So if you counted, there should have been 11 objectives that spawned in a maximum of 9min. As there is 12 bunker, if you get all objective, you know where will be the buff. If you didn't get the 11 objectives, well, choose your strategy, you could split team over possible bunker (for exemple if you missed 5 objectives, 1 hero could go in each remaining bunker). Or you could choose to all go in one bunker and pray to be lucky :)