This would be my concern too.My concern would be a seller using an authentic, tag(s) attached bag for the auction and then sending a replica. It's been done. Any tag can be duplicated and those nylon thingies that attach tags are not unique and can be purchased anywhere.
I cannot think of a valid reason this seller would have removed the tag. The nylon thingies don't break easily so it must have been cut.
IDK, I don't like it.
Since the tag was attached in the picture I too would have expected a bag with the tag attached. That is only logical and if it´s shown in the listing as attached then I see absolute no reason why the buyer should message the seller asking if the tag is on or off the bag????? That just makes no sense IMO.