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It is called a bailment which is created when you leave property with another who is to perform some service on it. Common example - leaving clothes at a dry cleaner. The bailee...the friend here...has a duty to exercise reasonable care to protect the item from damage while it is in his possession and to return it to the bailor in the same condition as it was when delivered as enhanced by the services that the bailee performed on the property.
This is information only, NOT legal advice. No attorney-client relationship has been created. Consult an attorney in your state for legal advice regarding your issue.