When using wildcard characters to search for an asterisk (*), question mark (?), number sign (#), opening bracket ([), or hyphen (-), you must enclose the item you're searching for in brackets. For example, to search for a question mark, type [?] in the Find dialog box. If you're searching for a hyphen and other characters simultaneously, place the hyphen before or after all the other characters inside the brackets. (However, if you have an exclamation point (!) after the opening bracket, place the hyphen after the exclamation point.) If you're searching for an exclamation point (!) or closing bracket (]), you don't need to enclose it in brackets.
For example: Like "[#]*"
The above can be found in the help files under "About using Wildcards"
HTH