假如你是Robert，你捡到了一个双肩背包，你的电话号码是3856723，请写用英语一则失物招领。

My name is Robert.Just somedays ago,I found a bag .Please who lose a bag ,you can call me.My phone number is 3856723.

i found out a shoulders backpack in XXXX, and if you sure that backpack is yours, please contact me as soon as possible.

tel: 3856723 Robert.

date: XX/XX/XX

I am Robert and I found a backpack the other day.If it is yours,you can contact me at 3856723.

date: XX/XX/XX

Hi, all. My name is Robert. I found a backpack in _________. If this backpack is yours, plz contact me. my Tel # is : 3856723