Hi,
To see beyond the three prices you mention, you need to have the price ladder open. There, you can see all the money waiting at all the prices by scrolling the ladder rungs.
Of course, just because someone has £2000 waiting 8 points below the back_price, does not mean that money will stay there. It might be cancelled at any point.
Triggers can place the bets for you, but triggers alone cannot read data that far up or down the ladder.