Oops! Didn't realize when importing all records had to be in the found set - duh.
Hit SHOW ALL - THEN imported. Usually just use relationships to do this stuff BUT a file is being sent to me from outside - live & learn!
I wonder if there might be more than just the visible digits in that first column of your csv file. You might make a copy of your file and do this import in the copy, but with the new records option instead of Update matching selected.
Then, click in the order number field of the imported records and use the arrow keys to move the cursor all the way to the left to see if any additional, invisible characters such as a space might be present in the field and preventing a match on the field like you expected.
Thanks Phil - It was just that you have to have any pertaining records in the FOUND set before you do a match import - odd, but working now - Thanks for your comment.
TEXT = "00010495"
Number = 10495