Answer: True
Step-by-step explanation:
An exculpatory clause is a form of contract provision which relieves one party of liability when damages are caused while executing the contract. The party which ssues the exculpatory clause is the one that is seeking to be relieved of any potential liability incurred.
There has already been a notice that "the garage is not responsible for any item stolen from the car". Roger parking his car at the garage is at his own risk as the garage owners won't be responsible.