The best one Ive had was an Oktagon 2008 card, it was wrapped in a piece of cardboard (top and bottom open) with the floppy loose, pinned between the cardboard and the card.
No external packaging or anything.
When the postman arrived he was holding the floppy in one hand and the card/cardboard piece in another.
lucky for me it did work although I have no idea if there was a manual. (Or better yet a piece of paper telling me what he had entered as the login on the card, so I wont enable the card's login software in case I cant un-enable it.
Other than that all my Amiga stuff has been good.
I did order stuff from Eclipse computers and they posted the computer case on its own, it arrived smashed, the side was bent, all the supports on the top inside of the case were bent, totall writeoff. They exchanged it no problem but those boxes are just not ment to be posted without being put in another box.
I post a lot of stuff and the Royal Mail seem to be good but I had to post a large order once and couldnt use them, out of the four £100 units I posted (Next day although they never collected until the day after) two arrived smashed.
These are units covered in moulded poly supports in a box with padding around it (Normally paper) in a double walled box, it must have taken a hell of a bang to break about five inches in to the box.