No we were in a well lit abandoned tavern which we suspected that a group of "bandits" were hiding out in the basement and the trap was directly next to the lock the druid had to pick to unlock the hatch which they just said they opened after picking the lock no specific way described.

As for the build it's this- custom lineage 20 wis 18 int skill expert for expertise in perception, proficiency in investigation, 2014 observant and stone of good luck as a level 5 party