Manual File of Return

 Hi Friends,

I have filed my returns for A.Y 2009-10 through my CA. I have noticed a few things:

1. My CA has filed manual writtens. (Category ITR-4).  before 31st July
   
   
2. I was given a copy of the ITR-4 Print and some acknowledgement  (seems to be generated from  ZenIT - A KDK Software Product as this is mentioned in the footer.) And told me to sign the form ITR -4 on page no. 7 and submit.)
   
   
   
   
   
   
   
   
3. A few days i.e. around september 9, My CA gave me a copy of acknowledgement with stamp of mumba income tax ward office.

But what I am currently reading online on many sites is that it is compusary to send returns to bangalore by post and get the acknowledgement. I talked to my CA and he said that it was manual file of returns and is not necessary. I am suppose to get  Income Tax refunds of around 37,000. So is the return valid?  (My income is not required to be audited).