[Tomte]

> Why haven't delivery companies cracked down on this? Maybe they have, but I still hear about it a lot.

I don't know about the American package delivery space, but assuming it's somewhat resembling the German one (sub-sub-subsidiaries, work days until 11pm, because you've got a quota etc.): because it is impossible to fulfil the quota. So you get creative, fill out some "did not open door" papers and hope you can get around to delivering them the next day.

And it's impossible to fulfil the quota because that's directly profit. So companies can choose between abysmal service (but still not so bad that customers would leave, because everyone is playing that game) and lower profits. They have zero incentive to "crack down".