Ditti,
As such I don't know what sort of warning you want to give to the employee for non submission of the documents, but I am giving you one draft for the same down below, you may change, alter it as per your requirement.
**************************************************
To,
Mr. xxxxxxxxx
Emp. Code...xxxxxxxxxxxxx
After going through your personal records it has been observed that following documents were not submitted by you till date, whereas you have given the undertaking at the time of joining that you will be submitting that documents by (mention the date).
List of Documents :-
1. xxxxxxxxxxxxxxxxxxxxxxxxxxxx
2. xxxxxxxxxxxxxxxxxxxxxxxxxxxx
3. xxxxxxxxxxxxxxxxxxxxxxxxxxxx
4. xxxxxxxxxxxxxxxxxxxxxxxxxxxx
It his once again advised to you to submit the above said documents by (Mention the Date), otherwise it will be presumed that you have taken this job with false certificates and the matter will be dealt accordingly.
Thanking You,
For XXXXXXXXXXXXXXXXXXXXXX
(Name of Person issuing letter)
(Designation) 
__________________
Everyone thinks of changing the world, but no one thinks of changing himself.....
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