They probably took out the box because it would look suspicious if he didn't buy an appliance recently and the box would look out of place. The box would then be a source of lead for the police if they decided to go to the store and ask if the guy was seen there.
I only read till ch.3 but I was really hoping for a twist like she was manipulating him or something, so far it's just wholesome or kinda what you expect
Knows her house by pure "coincidence"
She's actually a stalker and in the end she'll be sent to prison or die due to some confrontation.
I wanna see that twist.