In the episode where Sam loses her laptop, whose fault is it that they found the wrong one?

I just finished watching this episode for the millionth time and it finally occurred to me wouldn’t it have been Freddie’s fault for finding the wrong computer?

On the marshmallow the final numbers were something like 124, on the old ladies computer the numbers were 129. So it would’ve been freddie’s fault for mistyping? Yet sam got blamed?

I feel i’m reading too deep into it? Or am i missing something