This has happened twice with Amazon now:

[sarahs_muse]

One guy got sent a box of flash memory sticks, and this guy got a box of SSD's!

They're getting mixed up between "box of", and "a box"http://www.reddit.com/r/pcmasterrace/comments/2nlkgo/

Comments

[sarahs_muse]

The Distance Selling Regulations are very clear on this. If you’ve been sent unsolicited goods, you are entitled to treat them as an unconditional gift and do with them as you choose. You are not required to keep them for any amount of time and you are certainly not required to pay for them. Any attempt to demand payment (by threatening means or otherwise) is unlawful.