By the end of that day I had some answers from both Convincing and Undecided. They clarified things somewhat, but raised even more questions.
After Convincing and her subordinates were questioned in great detail, they recalled things from their perfect memory that they had originally dismissed as unimportant and irrelevant.
There were several episodes of the humans' stored equipment eroding and breaker faster than it was expected to, but everybody believed that it was because of the humidity. There were also times when the Agents noticed smells and glimpses of unknown creatures in vicinity, but could never get a good look at them.
Whoever they were, they were stealthy. And like clothes moths, they seemed to like eating stuff.
Undecided's Oracles have looked into their memories of the past and discarded "prophecies". From there they brought me reports that have never reached my table but *could* have.