I would not be comfortable with offsite shredding. We use an on-site shredding service and an employee watches them shred everything (it only takes 20 minutes once a month for our smallish bank). I simply can't imagine explaining offsite shredding to our regulators, but if I were to entertain the possibility, I'd for sure be making a site visit to the shredder and watching how they handle the shredding before signing any contracts. I'd also get 3 references of other banks doing this and talk to them about how their regulators viewed the practice. I'd also have the shred company sign a nondisclosure/confidentiality form and require them to send me a document certifying that they were sent 5 locking cans and they shredded 5 locking cans (with serial numbers) on such and such date and time.
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"Gratitude makes sense of our past, brings peace for today, and creates a vision for tomorrow." - Melody Beattie