Personally, I shot 2 zebras, an eland, and a duiker. They were not in my package.
When I asked how much I owed up to that point, and was told nothing, he let me swap the duiker for the steenbuck that was included in my package.
I had no intention when I arrived to shoot one zebra, much less two. However, after the implication that we had a "credit", I took a shot at a zebra and missed clean. No blood, no indication of a hit. The owner/PH insisted and assured me that it was a clean miss.
So, I took a shot later at another zebra.
Well, the next day the trackers found the first zebra while they were tracking another hunter's animal. So, I now have two zebras.
Again, though, I was also working under the assumption, as well as the owner's assurance, that I was not yet incurring any additional fees/costs.
Also, remember, even after taking the two zebras and the eland, I was told I owed no extra money.