Sadly, it is a good time of year to be wary. If you will ever lock your house, and lock your car both at home and shopping, now's a good time. If you can put purchases out of sight when you leave them in the car, that's smart. Bring in delivered packages from the porch regularly. Put your wallet in a front trousers pocket in a crowd, etc. I don't think you have to be crazy-paranoid, just wary.