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Those auction vehicles certainly are not out of the GM company car fleet. Per the GM tagging site, more people are looking than there are H3s available.
You will have some company vehicles show up out of the MI/IN/OH area, since GM employees hate to go out of state to pick up a vehicle, and if they are not tagged when they come out of service, they are sent immediately to auction.
Other vehicles that go to auction are the captured test fleet vehicles, which have been filtering out of service. Many of these are not taggable by GM employees.
There are two reasons a large amount of vehicles suddenly appear in the company car fleet. One, they are not selling, and two, IRS regs. Two weeks ago I was at the GM company car (PEP) lot in Pontiac, switching out a SSR for a Saturn VUE, and they had twenty H3s just delivered. Per the PEP person, they were ordered per IRS regs. (IRS states that since these are cars for evaluation, they must be put into service per ratio of the number of vehicles selling.) So, even if a vehicle is a hot seller, GM is required to put a certain number into service to keep the IRS from screwing with them.