just to play devils advocate here, i just sold an iBook on eBay and although i put one day processing time, aka ship same day, eBay automatically adds in:
Domestic Handling Time
Will usually ship within 1 business day of receiving cleared payment.
So basically, I will never overnight anything since it takes 3-4 days to get the money into my bank account.
Shipping method is usually specified as well, if not, you should have asked.
Brown paper is a
Although, I did just send out the iBook in the box it came in...It's used though so I'm not too worried. Insurance helps too.