Again, how do you know when and how the smell developed?
It is possible the bag was fine when produced and boxed. And no, the SAs don't open shipments as a rule.
This thread is devolving into "they should have" and "I'm sure they didn't" when the truth is we just don't know.
All anyone knows for sure is what they have been told by their Hermes salespeople when returning bags, and attempting to obtain new ones. it would be helpful for the people affected if speculation as to why and when Hermes did or did not do something was kept to a minimum, if posters don't have first hand information to share.
Well I know for a fact, first hand, that my SA opened my shipment prior to calling me and letting me know that it had arrived.