What's the deal with the approvals?
Is this basically:
Buy a new gun and you must buy a gun lock.
Only certified gun locks are ok to buy with a new gun.
Any problem storing WPD (weapons of paper destruction) in pre-approval-era safes?
If you don't sign the safe affadavit, you must purchase a qualifying lock for that specific gun within 30 days prior.
If you have a safe that meets the DOJ requirements, you just need to sign the affadavit to that fact. My safe was purchased prior to the requirements but meets them all. I have never purchased a gun lock and pretty much throw away the ones that come with the gun.