Create another queue to pickup those messages without any probe attaching to the queue.
Then use DrNimBUS to view the messages in the queue.
At the primary hub with the IM console running it can be started either via the shortcut in the program group or C:\Program Files (x86)\Nimsoft\bin\DrNimBUS.exe.
click the 3rd icon from the left View Message in Queue
click the expand icon in the right corner
select the queue
click the + to display the contents of the next message in the queue
do not click the green arrow since it will just pull all the messages from the queue