A donor brought cans with deep dents to our food collection. How do I reject them without embarrassing her?

She'd carried the box from the bus stop and was pleased to add twelve tins to our collection. While unpacking it, I found three with deep, sharp dents crossing the rim seams.

"They're still closed," she said when I set those aside. Another volunteer suggested putting them in the donation crate so the receiving food bank could decide. I felt awkward standing there with what looked like a judgment on somebody's generous shop.

[USDA shelf-stable food guidance](https://www.fsis.usda.gov/food-safety/safe-food-handling-and-preparation/food-safety-basics/shelf-stable-food) distinguishes minor dents from deeply dented cans and says to discard cans with a deep dent on a seam. I won't send these three for somebody else to eat or assess by tasting. The collection organiser is available, and I can ask them to help handle the conversation and disposal.

How would you thank the donor for the sound items while explaining why these can't join them? I'd also like the volunteers to follow one clear checking process so donors aren't getting a different answer from whoever opens the box.