We know today Kunal for his AC, will get the medal back, so just like seeing the medal ,sidhi guessed it was his medal. and then thought no how can it be , there is no need for him to sell his medal similarly Kunal looking at the medal might feel.. "sidhi ke aansoon, medal par, nahi kaise ho sakata hain, woh to jail mein hian.."
well why not.. if after seeing once she can recognize his medal..Kunal has seen sidhi shedding tears million of times , so he definitely can guess ..