For the extra labor I was referring to people actually receiving the mail, opening it and getting the samples into whatever tracking they have. My guess is tha

For the extra labor I was referring to people actually receiving the mail, opening it and getting the samples into whatever tracking they have. My guess is that there's still real people doing that step, since a machine that can do that reliably and not screw up and/or contaminate systems with the weirdness they get in the mail is probably on the order of a machine that can accurate pick items out of bind in Amazon warehouses (or harder), and Amazon has thrown a lot of money at that just to find it's a lot harder than it seems. Even if it's just people receiving the mail and throwing it into a bin that's delivered to a specific lab tech, that still takes people. The other labor was really just going by your own numbers. Beyond that, there's still the layers of management above, that while there are physically less of them likely, their pay scales higher as well.