Well, no sign of "Conrad" and no sign of the box despite being on hands and knees looking. Lots of buggy traffic since it was Sunday mornign around 9:15am.

This is our second attempt at this box, with no luck. Conditions were perfect for searching, and we spent at least 15-20 minutes on hands and knees looking in the right spot, and all along the rest of the bridge, too. It's a dirty, dusty, cobwebby place and you have to get your head almost onto the road. It's only one lane, and cars pass regularly even on a weekday afternoon. It would be very, very easy for the box to drop into the river below.