You make a reasonable point, but what if you didn't know you had found a cave until later, like:
It was dark, and we were running from king's guard, and we took shelter behind this rock, and hid there, but apparently, we had found an underground cave.
There are two definitions of apparently in English 1. something you're not sure about. 2. something different than expected.
Klingons might not use -law in both senses. This apparently (
This course requires that you match the Klingon perfective suffixes by using the English "have/has/will have" helping verbs. This is not a perfect match, but they can often be used in the same situations and the course was not designed to teach those subtleties. In most actual uses, there is no significant difference between We apparently found an underground cave. and We have apparently found an underground cave.