Issue with deleted messages in SMq2

Hi Experts ,

I am facing a problem / query on message deletion in SMq2. Some messages were deleted in SMQ2 instead of cancelling them in sxmb_moni.

Basis team has asked me for explanation on the same .

Issue is , the message ids provided by basis team actually show me successful messages with chequered flag in sxb_moni.

How is it possible that they are successful in moni and basis is saying they are deleted messages.

Basis aslo said : quote

This happens if a user deletes queue entries manually using transaction SMQ2 instead of canceling messages using transaction SXMB_MONI, Messages without queue entries are not processed further. They cannot be restarted, deleted, or archived, and remain in this status.

This messages are missing qRFC entries.

Now my question to you all is , is the basis team providing the correct information about the messages, and if so , how do I identify the same from the successful messages in moni.And going ahead , is there any way I can monitor the same wether any message has been deleted from SMq2/SMq1 on my own ?

Regards,

Arnab.