Whenever I offload macs, I use deploystudio still. (CAN'T WAIT TO CONJURE UP A 1K+ T2 OFFLOAD! ..lol) ,
The MUT has all you need! (For This) - I haven't taken the time to deep dive into an alternative API solution.
1st I create a static computer group for the computers that need to be removed from the JPS. Then I create a spreadsheet with all of the computers I need to delete and use the mut to upload it to the JPS. The Mut places them into the static computer group. Then in the JPS Dashboard I select the Static Computer group, I select the 'Assignments Page', I click view in the bottom right, then I select the 'Action' button in the bottom right, then I select the option 'Delete Computers'. Then I confirm I want to delete the computers and wallah, no longer managed and no longer exist in our JPS Database. (Also, must be removed from ASM or ABM, DEP / Prestage, etc...etc...)
Then boot to deploystudio server & Deploystudio runs a shell script for a 3 pass wipe - then installs an OEM Image. I have 3 Off Network Mac Mini Servers that run independently of one another, Each connected to 2 x24 Port Dumb switches - I can knock out about 200 - 250 computers a day. 3 pass wipe usually takes about 3-4 hours. Very Manageable as you simply need to take 10-20 minutes to swap out / boot the machines to deploystudio server once every 3-4 hours.
diskutil secureErase 4 /dev/DISKhere
$ diskutil secureErase
Usage: diskutil secureErase [freespace] level MountPoint|DiskIdentifier|DeviceNode
Securely erases either a whole disk or a volume's freespace.
Level should be one of the following:
0 - Single-pass zeros.
1 - Single-pass random numbers.
2 - US DoD 7-pass secure erase.
3 - Gutmann algorithm 35-pass secure erase.
4 - US DoE 3-pass secure erase.
Ownership of the affected disk is required.
Note: Level 2, 3, or 4 secure erases can take an extremely long time.
