Lost iPhone4S, Kindle DX, Wallet in Northface Borealis(Black) backpack

Around 3-4pm today (Feb 27 Mon), I lost my backpack at the gym.

Backpack is Northface Borealis black.
There were iPhone4S black, Kindle DX (large, grey), wallet with IDs, credit cards, money, concert tickets, movie tickets, etc.

Unfortunately, I guess they were stolen since the phone was immediately turned off that I found my back was missing. I was at the gym for less than a hour. Kindly enough, he or she left keys and Stanford hoodie.

I've tried to find iPhone by Apple's service, it seems it's never turned on yet, or already reset.

Please contact me. I'm so desperate. It's more than $1,500.

By any chance, if you brought them by mistake, please leave them at the gym locker again.