Receipts in Your Gmail: Find by Entering a Hidden Smart Label in the Gmail Search Box

For users of Gmail,
Alan Henry at LifeHacker has a valuable tip and detailed discussion
about a smart label search for receipts in your Gmail.

See
Find Receipts in Gmail with This Hidden Smart Label.

The trick is to enter

label:^smartlabel_receipt

in the Google search box at the top of Gmail.

It will not work if you just plug it into normal Google search.

Hat tip to CaryGEE.