I have ordered rare earth magnets several times and it's always interesting to inspect the packaging when they show up. Clearly there are a lot of metal parts in Royal Mail's sorting machines as they frequently arrive in an absolutely tattered padded envelope, usually with tape patches over big holes ripped in the side.
If you can find some N52 grade magnets it's worth ordering them just for the novelty value. Hand someone a roll and ask them to peel one off the end. Or, stick one on the refrigerator with a note "pull this magnet off" and see who falls for it. They are so strong it's like seeing an alien technology in a sci-fi flick.