These days I have seen numerous cases where the employment contract of the employee uploaded at LMRA's website for the visa is different than the one really signed by the employee. The contract which employee has will be showing more salary than the contract uploaded on LMRA's website.
As you understand forgery is a crime and you can use this document to punish the person who has wronged you for a long time. The reason for forging your employment contract could be as follows:
1. Paying lesser amount of GOSI
2. Paying lesser indemnity
3. Paying lesser compensation
4. Paying lesser end of service benefits.
5. Court will give the lesser amount to employee on basis of forged contract
6. Forgery is a habit.
Please note last week an employer was sentenced to 6 months jail for forging the contract. If you believe your employer might have done the same then go to LMRA and ask for the contract copy and see whether it is the same as signed by you. If not then you definitely can file a police complaint against the employer.
One important thing to note is as I heard from some clients the LMRA at Mina Salman doesn't provide the contract copy so try at other branches.