Your only option, if you believe they stole the property and they won't make good on it, would be to sue them for the value of the games. You could potentially sue in small claims court (the value would be low enough; check your small claims court rules for what types of cases may be brought). You could represent yourself  to keep costs down. You would have to be able to prove by a preponderance of the evidence (i.e. "more likely than not") that the contractor or his employees (the employer is responsible for the actions of his employees on the job) stole the property. The contractor would be able to attack your evidence and/or present his own evidence in defense. There is, unfortunately, no way to seek compensation other than by suing.