The key is whether you qualify as a "tenant" under Nevada landlord/tenant code. Your boss was mistaken, because it is unlikely you are a tenant as defined by NRS 118A. Under landlord tenant code, “Tenant” means a person entitled under a rental agreement to occupy a dwelling unit to the exclusion of others. Unless you were under a rental agreement, you are simply a guest, and they can ask you to leave any time they want.
The law does not allow you to occupy a space for free. You have to leave if they ask you.