I just arrived internationally at DFW. I had nothing to declare and had the "show receipt at exit" message. DFW switched to unified passport control/customs awhile ago, but today the process was a bit different. The USCBP officer at passport control said my receipt was a souvenir to keep. The officers at the exit downstairs confirmed this for me as well as another traveler who were sort of in disbelief. I saw others with their receipts as well, yet some receipts were still being collected upstairs.This was not the case as of early January at DFW when all receipts were collected, regardless of declaration. Needless to say it was a bit disconcerting considering this is probably the biggest change from the way things have been done in the 9 years I've been a part of the program.

Others who've recently transited DFW have confirmed this as well.