ILR - Extension letters (UK) missing

[immi_saikat]

Hello Immigration gurus,

I would be applying for ILR in Oct 2012 with my case

1. Entry Clearance as WP holder - Oct2007 (with 1 yr validity)
2. Several ICT Tier 2 extensions - Sep 2008 - Jan 2011 (3 times)
3. Switch to Another company - Tier 2 Sponsored visa Aug 2010 - Aug 2013
4. Finally to Tier 1 - Feb 2011 till date (expiring Feb 2013)

When I was collecting documents for my case (complicated!!), I found 2 extension letters missing (point 2 above), however my passport bears the stampped visas.
Is it really required ? If so, I need to ask parents to look into documents i kept in my house in India (god knows where!!!) - really dont want to give that pain to my parents.

Please advise.

[ILRHolder]

Extension letters sent by UKBA are not required as they check their records anyways