Witness & Verify.  Have multiple employees and coworkers witness the destruction with you.  This is your verifiable proof and corroboration of a secure Chain of Custody.

Documented Proof. This is your documented proof to show your boss, CISO, and auditor that you complied with data security guidelines.

Protect yourself and decision.  Data Privacy guidelines require organizations to perform proper due diligence on vendors handling your data – this includes data destruction vendors.  NAID is the preeminent due diligence auditor for data destruction.