Just out of Interest

Just updating my files of the Lithgow Survey.
I am a bit bemused by the small amount of low numbered rifles throughout the sheet.
1913 has 1 two digit number and 8 three digit numbers, what you would expect from early production.
But after that it seems that low numbers are very scarce.
A series has 1 two digit and 3 three digit numbers,
B series has 4xthree digit,
C series has 4xthree digit,
D series has 5xthree digit,
E series has 3xthree and F series has no low listed numbers at all.

So what happened to all these rifles? seems a bit strange not to have the odd one listed.

Is it known if each series started at 1?

Btw did they include zeros before the 1? aka 000001?

It's all to do with mathematical probabilities Muffer....... Maths, my favourite subject....... Don't forget that out of the whole, say, D number series, there will only be 9 rifles with one number, 89 with 2 numbers, 999 with 3 numbers and so on. So by definition, there WILL be fewer of the singles