OPT STEM Extension - what are consequences of Employment start date mismatch ?

[abhi2desi]

I am applying for OPT STEM extension. My CPT started on August 20, 2013 as per i20. But my employer gave me employment letter stating start date as August 10 2013. I submitted this offer letter mentioning August 10 as start date to get CPT i20. So I dont know which date is there in SEVIS record.

My CPT ended on Dec 13, I continued working on OPT (validity is Dec 16, 2013 to Dec 15, 2014) without any break.
Now, I am applying for OPT STEM extension. Should I submit same employment letter that I submitted for CPT ? I am concerned because CPT dates in i20 and employment letter are not matching.

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http://www.desiopt.com/index.php?show_emp=1213

http://www.desiopt.com/index.php?show_emp=3648

http://www.desiopt.com/index.php?show_emp=3561

http://www.desiopt.com/index.php?show_emp=4297

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