My fiance had an contract with a woman who owned a boutique in West Hollywood. He had his artwork hung on the walls inside of the store, wth the agreement that she would help him sell it. She closed the store without any prior notice, did not return his artwork, and didn't contact him. His contact information never changed. Meanwhile, he/I have been unsuccessful in reaching her. She also owes him about $700.00 in back pay that she stated she would 'make good' on. The artwork is valued at approximately $10,000., however, we would be willing to settie for $7500 total. The return of the artwork is paramount, as it is intangible. What would be the best way to proceed?