I tried. So far, I've only had luck with getting one all wiped, re-installed and ready for resell, since I have to use Internet Recovery to install the MacOS on a T2 chip-equipped Mac to check if it's still managed, change the security settings to enable booting from an external drive, then wipe the drive and re-install the MacOS (i.e. the highest version it'll support). The other three I've been working on, I've had no luck with getting Internet Recovery to load onto them, Wi-Fi or Ethernet. I wonder if it has something to do with the drive not being initialized, and/or the battery apparently being dead (the one that worked still has a good battery).Maybe I'll take one of these problematic Airs and use it on my secure home Internet, and see if that works. Then once it's reset and ready, I can bring it back into work to be logged and ready for resell. I've done it before.
I was able to get another to load the Internet Recovery Mode and start installing the MacOS. Since this one has a 512 GB SSD, I may consider using this one as a work computer, for running the latest version of Apple Configurator 2 and any future reviving and restoring of Macs with T2 chips, now that my 2015 Retina 15" MacBook Pro can't run the latest Apple Configurator and doesn't have Thunderbolt 3. (For now I have to bring my M1 MacBook Air into work for this.) But the first attempt at this, it hung at "Less than a minute remaining..." while the status bar was nearly halfway through. This second attempt after resetting the NVRAM and SMC and rebooting the Air, I started the second part of the install a little over and hour from posting this, and the bar went all the way to the end, but it's still seeming to hang there. I'm gonna let it sit this way through most of my shift to see what happens next. If it's not done anything before I punch out, I will reset the NVRAM and SMC, and reboot the Air again and see if that does anything overnight.