All of them have been overwritten with zeroes and validated with smartctl to have either 0% usage or 2% usage (representing the remaining write endurance of 98%+).
These were used in datacenter servers, so you can use them either with a U.2 drive bay, or with an adapter (they are available from m.2 ports as well as regular PCI-e ports).
These are enterprise drives and are extremely high performance, meant for high endurance workloads. These would be incredible for servers or workstations.
If you're shopping for NVMEs - as a comparison:
The 9300 series is newer, higher performance tech than the 7300 series. The MAX version is more valuable and higher endurance then the PRO version.