Here are some tidbits from Rob's excellent interview with Toni/Dallas:
How the pouch was lost:
Dallas was in the cab coming from the Roadblock
His battery for the sound mike required changing, so production undid the POUCH to change the battery!
Dallas then changed cabs, in the second for 20-30 minutes, went to the hotel where they had spent the night to get some help from the concierge, at that point when he went to pay the taxi realized that he no longer had the pouch.
The Long Walk:
Toni and Dallas consciously took the Metro knowing that they should be in a taxi, but knowing they did not have enough money
They expected a 30 minute penalty and were surprised when they were told to go back
AT that point however, cameras were not allowed on the Metro after 3PM, so they made a 2 hour walk back, where they met Phil and were eliminated
Production told them that at that point they were only 30 minutes behind Ken/Tina
Re the Passports:
They were returned to the Embassy late that same night, presumably by the taxi-driver
The next AM, when T/D called the Embassy, they were told the passports had been returned.
By that time it was too late for them to reach the Mat in Portland in time to join the other teams.