My Dearest Ladies,
Me thinks that Goon#1 gives the delivered food pack to Arnav while he's on the phone with the Big Boss and in his carelessness, accidentally hands the bill along with. Since the food was delivered to the address, the bill states it and thus, Arnav gets to know of his whereabouts! On listening in on the conversation between Goon#1 and Big Boss, he realises that a courier is being sent off to "Shantivan" and somehow, the "Pea-Brained" Goon is going to have the parcel (yet to be couriered) lying around and Arnav shall sneak in the chit of paper with the stated address to Khushi!
And as I said to begin with, ME THINKS! Could or could not be the case!
Happy watching - Go Team Sarun 😃