This would not be breach of contract, since  a party is not liable for breaches caused by the wrongful acts of third parties not under their control. If you signed a loss waiver, your potential recovery is limited by its terms--but only by its terms: check to see if theft falls under the limitations (i.e. "stolen" may not be "lost" or "broken"). If you had renters or homeowner's insurance, you may be able to claim under your policy. You cannot sue for emotional injury from theft in any event.