Making a second post as couldnt help analyzing this symbolism. Dev's wallet which signals his wealth ends up in Sonakshi's hand, by mistake
There Dev and Ishwari thinks the wallet is gone, the ATM cards has to be cancelled. Ishwari asks about the money and tells it is a loss.
But the wallet is actually safe and will come back to him. It shows one way or the other his real wealth is Sonakshi, which Ishwari thinks as a loss.
He thinks of cancelling ATM cards and all. There will be a time when Dev will have to cut his expenses as the wealth might drain. But wealth will come to him, through her when he needs it the most. Just like that wallet coming back to him.