Also this time of year, it is not uncommon to leave packages in the passenger section of the car after shopping. Also an invitation... do not leave anything of value, or what may be mistaken as value - such as shopping bags or boxes - visible inside your car. Don't try to cover them up either - lock them away in the trunk or, better still, get them inside with you.
Keep your car locked and in a locked garage (if you have one).
Don't set yourself up to be a victim.