To see or carry a briefcase in your dream, represents your level or preparedness in some situation or circumstance. It also refers to your concerns and worries about work and travel.
Work, your career, your responsibilities.Losing your briefcase could mean you feel or fear you aren't
Staying on top of your responsibilities, you need to pay more
Attention to them, or the work area of your life seems neglected. Someone stealing your briefcase could represent a real or imagined threat to your ability to fulfill your work-related responsibilities.