Instead of some number of Amazon packages with unknown contents going missing, cops and the recipient immediately know that $8k of headphones were stolen. It's obviously over the threshold of grand theft. Etc.

And then if anyone is poking around at secondary markets, you have a massive number of item X showing up new-in-box grey market in a zip code where a bunch of that item was stolen.

Compare to having 20 random consumer items, all stolen from different end-recipients. It's hard for any authority to know these items were stolen. It's hard to establish you stole them or were knowingly receiving stolen property. Even if they surmise that they're probably stolen, as far as they know you could have committed petty theft several times at unknown places.