I'm trying to make a saved search that will find all sales orders with a shipping address of PO Box. When customers order on our website, they could type in their PO Box address with various spellings. One of our former consultants created a saved search with these criteria in the screenshot to make sure the saved search pulls in every scenario in which a PO Box address is entered. But if the operator is "contains", wouldn't we only need a line that says "contains box"? That way as long as customers don't misspell the word "box", the saved search would find any PO Box shipping address? I know it is possible that the saved search will find other orders with "box" such as orders shipping to "Boxwood Ave", but in this case we are okay with that.

I'd agree you should only need the last line. Only one way to find out: test it!