The logs to identify the user who deleted/saved the queues from SMQ2 can be found in transaction SM21. In selection screen of SM21 enter the following values: From Date / Time = Enter the date/time the queue was deleted. Message ID = Q26 and Q2X. Transaction code = SMQ2.
This blog will give an overview of all standard functionalities provided by SAP from Logistics perspective which we might have overlooked during our regular practise.