Mr Sitaram Yechury being a respectable member of parliment should not indulge in suspicions but pave the way for catching the real culprits.
Its a large sum of money and it can be traced.
I once gave cash to my broker in shimoga and it contained a couple of forged notes.
These could be traced by my bank and they had every detail of the origin of these notes.
So if you just allow the bank to trace the origin they would do it in a niffy.
But if you allow the CBI of the FM to do this work, then they will set up a probe wasting the taxpayers money and then take you round for another voting process in parliment before telling you that it is impossible to trace it and that there exist no known culprits and finally complain that there was no such flashing of money itself, but a fit of imagination invented to bring down an elected government. THATS THE WAY OUR GOVERNMENT WORKS.