Yep.
According to Merriam Webster...they were most definitely robbed.

rob (verb)
: to take money or property from (a person or a place) illegally and sometimes by using force, violence, or threats

Doesn't specify that it is always by force...just sometimes. I'm pretty certain it's illegal to go into someone's shorts, take their keys, open their trunk, and take their money without their permission. Top reason I never leave my purse in my office unattended.