Need clarification regarding 14yrs long residence applicatio

[jko]

I applied for 14yrs long residence ilr based on long residence, marriage to person present and settle in the UK and article 8 of human right act. My wife and kids are british citizens. After a long delay, I wrote my local Mp to find out what was causing the delay with my application. They replied that my application should be decided by the end of 2009. Last month, I received a letter from the HO requesting for;
Evidence of current address[within the last 3months], evidence of co-habitation within the last 3months, 2 unseparated passport photographs and completed immigration status questionnaire to be returned within 28days.
My concern is when I entered the Uk, the citizens of my country did not require visa. I only completed a form at the aiport and I was given one month by the immigration officer. I have lost my passport since then, and I do not have a photocopy.
The HO ask me to complete the immigration status questionnaire and provide sufficient information to help them determine my lawful entry or else, they will assume that I entered the UK illegally (illegal entrant).

What are the implications of this?
Will they be able to find my entry information in their system?
Contributions is welcome from forum members with similar situation and members who have experience in this area.

[UKBAbble]

Will they be able to find my entry information in their system?

If you were admitted for one month there should be a landing card on record.

[jko]

Thanks for your quick response UKAbble. It was 6pm today that I received a call from my solicitor that I have been granted ILR and all my original supporting documents have been returned.