Who sent me this book?!?

So heres the ironic yet/mysterious part. So I purchased keepers of the garden from ebay three days ago.And yesterday I recieved that same book from amazon.com LLC, and then the rest of their address...My other book I purchased from ebay, should arrive today, april 28, 2011... On the amazon reciept it shows that the order was placed on the 26th, which was 2 days after I purchased my other same exact book ! Also on the reciept it shows, it was a gift!!! No price how much it costed. On the package ot came in it shows amazon.com as the sender and then my address below. There is a tracking number on the package too! In my amazon account there is no order I placed for that book! I need help/opinions....plz....ironic how this haplened ohh one more thing that made me intrigued was also on the package it came in...right were it says my addres there it says: my first and last then this follows: ............................(JD) why does that show that!? Is that the secret senders initials? Or my middle name and last initials....? I feels its the senders initials, but I could be wrong...