In all my time mystery shopping, I have NEVER had a company reach out to me about mailing in hard copies of collateral over a month after the shop -- until tonight! Generally, I'm very good at keeping things around, but I really thought I might have thrown this one out! Thankfully, I still had it, but it was definitely a reminder about how important it is TO keep everything for at least three months, or even longer if that's what the instructions stipulate.
Just thought I'd post this as a reminder to others, too!