This question was brought up in another thread, but the answer is sort of buried down in the thread, so I thought it would be helpful to put this into it's own thread, since this is not anywhere in the rulebook.
Keep in mind that the IB auction is for only one of the six broker spaces. So, in the case of the other five, those would be added to as normal (though no new auction can be called on those spaces until the current one completes, of course). For the "active" broker space where the auction is taking place, yes, ALL money/containers due to be placed in that spot as per normal rules are just set to the side until completion of the current auction and immediately following that they are moved into that now empty broker space.
The reason for this is to avoid any prolonged bid-escalating due to increasing funds/containers in the broker space. It is action-expensive to call and win an auction at the IB, and the opening bidder should be able to know what is there when making their bid without having to worry what will pile in later.
But also, it is a bit unusual to see more than 2 or 3 "raises" of the bid during an auction. Because it costs an action each time a bid is made, making a slightly higher bid at the outset will probably save you a good deal of actions in the long run. Compensation for a failed bid is minimal, so try not to lose too many actions this way.
Original thread: https://boardgamegeek.com/article/29536967#29536967