The Check / Reference # selection criteria can be used to narrow down the entries in the resulting output.  This is a "best match" control, that is, the system will attempt to match entries beginning with the characters you enter into this field.  This field will not support the concept of a comma separated list.

Should the values being searched for contain leading zeros, you will need to include the leading zeros or supply a leading % character.

 

Also, for more complex searching: