When putting an asterisk, '*', into the search messages history in the AWI:
More messages are returned that what was searched for
Release : 12.3.4
This behavior is by design. The use of wildcards are not permitted as they cause behavior like this.
From the documentation here: https://docs.automic.com/documentation/webhelp/english/AA/12.3/DOCU/12.3/Automic%20Automation%20Guides/help.htm#_Common/CommonFunctions/CF_WorkingWithMessages.htm#link5
"You can search for alphanumerical strings. The search is not case-sensitive and it does not support the use of wildcard characters."