I think when sagindragin said, "do you think i have not done that", he meant that he'd already had a good Google. The question was can anyone confirm the s/n of YQ-X, which was allotted to an F.Mk.I prior to being worn on F.Mk.III EE274.
Hint: the answer will be a serial number between EE210 and EE229.
sagindragin: Good luck. I hope you manage something more substantial than "I Googled it".