Dropping it off at the police station does nothing to get it back to the owner, and would NOT releive him of liability should something happen to the package, and in fact it's likely the police will laugh at him and tell him to take the package elsewhere, this is a civil matter and not their responsibility.
Your friend can go to the post office and ship the package to the warehouse, insured and certified, 2 day shipping would probably be sufficent, overnight not necessary. But again, would still be the problem of getting the CORRECT package.
Your friend was negligent and now must pay the consequences, either going back there in person or paying for the shipping to fix the problem. He could try Tranq's suggestion, probably a 50-50 chance of winning.
Your friend can go to the post office and ship the package to the warehouse, insured and certified, 2 day shipping would probably be sufficent, overnight not necessary. But again, would still be the problem of getting the CORRECT package.
Your friend was negligent and now must pay the consequences, either going back there in person or paying for the shipping to fix the problem. He could try Tranq's suggestion, probably a 50-50 chance of winning.