DHL delivers prescription to wrong house........?

My sister lives in Florida and is very ill. She takes many different types of medication. One of them is Vicadin and it is delivered from the pharmacy to her house by the carrier DHL. Last week they delivered her prescription to a house two streets over, doesn't even have the same address numbers as her. There is reason to believe the driver of the company knew it was a narcotic rx and delivered to this other house on person as the driver has been out "sick" since he delivered it to the wrong house. DHL has made many attempts to recoup the package but to no avail. They even gave my sister the the address it was delivered to. She has gone over and knocked on the door but no one will answer. This stuff has a street value of over $600 and my sister cannot work without. My question is will the police get involved in a case like this if DHL refuses to make a claim? They have pretty much told her there is nothing they can do now and a claim will take up to 60 days to process!