Mistake and Placing in Someone Else's Trunk

Hello Rabbi, A person got confused and placed an item in someone else's car trunk instead of their own for a few minutes. Is it enough to apologize to the person and ask to retrieve the item? Is there any kind of theft involved here? Was there a theft of space, and does one need to ensure the person forgives?

Hello Rabbi 

An apology is sufficient. 

He did not cause damage, but used it inadvertently without permission. 

Have an additional question on this topic or need clarification? Leave your comment below. (Please note that the comment will not be published but will be sent directly to the answering Rabbi for review and a private response)