could be---I still think it highly unlikely that someone with the connections to deal in stolen passports would see them and take them in those few minutes, but I might well be wrong.
My understanding is that the major value is in stolen blank passport books taken from processing centers before they are issued to anyone, and that a passport known to be stolen and reported as such is almost worthless (stolen from someone NOT travelling and not likely to miss it and report for months or years is far more valuable)--again why thieves routinely leave behind passports after stealing bags, as a PP reported and as DH and his coworkers had happen once-----bags were taken from 3 rental cars while they were all inside eating dinner. Next day, all of the passports, as well as the Chinese configured laptop and (luckily) DH's sunglasses which are a pricey but not well known in France (especially 6 years ago) brand, were found abandoned on the roadside along with similar contents from other groups. Thieves kept the "valuable" stuff---passports were not among the items kept.