Oh it's leaking, in fact cracks are starting to appear.
See this WND article pointing out the anomalous sequence number of Barry's CoLB.
Susan Nordyke was born at 2:12 p.m. Hawaii time and was given No. 151 – 61 – 10637, which was filed with the Hawaii registrar Aug. 11, 1961.
Gretchen Nordyke followed at 2:17 p.m. and was given No. 151 – 61 – 10638, which was also filed with the Hawaii registrar Aug. 11, 1961.
According to a version of Obama's purported short-form certificate available from FactCheck.org, Obama was given a higher registration number than the Nordyke twins. The online image indicates the number is No. 151 – 1961 – 10641, even though he was born Aug. 4, 1961, the day before the twins, and his birth was registered with the Hawaii registrar three days earlier, Aug. 8, 1961.
The middle figure in Obama's purported registration also is different than the Nordykes'. Obama's is 1961, indicating the year, while the Nordykes' is merely 61.
That last difference is not any big deal, other CoLB's from the period show the full year
The Nordyke twins were Barry's classmates, at Punahou School.