I get the authentication code on my device, but when I took it to return the package I was told 2 hours.  Slightly confused, I now have to sign in to get it back.  When should I 'iniciar session'.  Do I get the code backk just before I go to return, in the shop or what?  Help would be much appreciated. 

I'm guessing : you took it to the papershop/stationery shop in San Francisco??

Normally after you get a code it takes a while to pass the information to them, it's not real time computing - I was told come back tomorrow and sure enough no problem with the code I had.

Print out what you have if you can, the shop will only have the code you got, when it receives it, asking for another code is another days wait.

I did.  Will log in tomorrow night and take it down Thursday.  I used to bookmark the code and it would be there for days.  Now when you go retrieve it you have to log back into Amazon.  Thanks Drax