Can't find the "smugglers' hiding places"

[Malacar]

This is a secondary objective in the "Master Key" mission. I've found two hiding places near the zone exit but the objective is still incomplete. Is it a bug, or there are more hiding places?

[魏凯旋 Furious Anger]

I never found it either.

[Amone]

its on the level with the bugs, the hiding is after you go throught a hole. The spot is near the stairs