And it’s not like you’re going to reuse the drives internally - if you were, there’s no issue - reformat and move on. But that doesn’t really happen either - each project has accounting, and it’s more effort to adjust the accounting, plus the risk of moving a used drive.
Risk really drives a lot of enterprise stuff. Good way to lose your job is to accept risks, especially ones like this that can be completely mitigated by simply destroying drives. That money has been amortized/allocated already, so it’s a much better value than the risk.