Tread carefully, for any insects underfoot are as likely to be landlord as louse.
If one spends any decent amount of time in this hold, they cannot fail to become aware of the occupants in the rafters. Conversations hushed as eyes drift upwards, faint creaks and moans of the plywood covered boards, shadowy flickers of movement behind obscuring curtails of dark fabric.
However, if one truly wishes to find out, they can attempt the leap from the top of the stairs, or request for a ladder to be dropped. Of course, there must be other ways up, if only one were to discover them. Uninvited guests are strictly discouraged, and will be met by the Baby Chimera and its Fear Rede.
