Literature Grammar Help!!!

coralyn

Newcomer
Joined
Nov 12, 2013
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10
Location
Philippioes
I'm putting up a signage on my shop. I got this so far..

PLEASE DO NOT LEAVE YOUR VALUABLES UNATTENDED. The management will not be responsible for theft or loss of personal property.

Is my grammar correct?
What are other ways to say this?

Thank you!