Given that this is a laptop we’re talking about, OP is definitely over selling it. Bring a backpack, unpack the laptop box into your backpack (assuming the box is too big to fit in the backpack itself). Something bigger like a TV would be more problematic.

The main worry is that being seen with new-in-box fancy electronics makes you look like “guy with money”. It’s not so much that someone’s gonna steal your TV on the subway, but if you can afford a new TV your wallet probably has good stuff in it.