Taking their time to find out more about the kobold raiders, while waiting on their enchantments to be finished or brought to Phlan, the adventurers find out a few things.
Most notably, kobolds are pathetic little creatures, who would rather hide under a rock than fight with honor.
To muster their bravery, they need large numbers, much larger than whoever they are attacking.
Survivors from the raids also mentioned that there were literally hordes of them running around. Dozens. Hundreds! Ok, maybe that was an exaggeration, at least it sounded like one.
But their numbers should not be underestimated, so much for sure.
Also, most sources of rumors, of which there are only few, point to the north. The bands have been seen traveling northwards after a raid - usually on a trade caravan or small travel group - was finished.
Additionally, all of the raids have happened in the area between Phlan and the outpost further in the west. Outpost? Yes, there seems to be an outpost further in the west.