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Zev & Justin did not ask Phil how he knew they were missing the one thing you must have. Why would they go rummaging through all the stuff they were carrying looking for it? Made no sense to me.
It was Zev's passport that was lost. Zev has Asperger's Syndrome. Justin is well aware of Zev's Syndrome. I have known a person with Asperger's. People with that syndrome are constantly losing and forgetting stuff. One would think that Justin would have kept Zev's passport for safekeeping.
After looking through everything in their backpack, Zev & Justin called their taxi driver, Thierry, they'd befriended. Where did they get a phone? How did they know Thierry's phone number? Thierry returned and took the pair back to the Roadblock location where no passport was found. Thierry then took them back to the Pitstop where Phil eliminated them from the race.
The Poker Pair, Maria & Tiffany, came in last. Sam & Dan became team #1 after the Zev & Justin malfunction. The Harlem Globetrotters, Flight Time & Big Easy were team #2.