When a silent letter refuses to stay silent

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I was at a boutique store today buying a few things. After I paid, the cashier handed me my receipt and said, "Here's your receiPt." She pronounced the P at the end instead of saying it the usual way. At first, I thought it was just a slip, but she said it several times while serving the customers before me. Her manager (or at least someone who seemed to be supervising) was standing right beside her and didn't say anything. I'll admit, it started to grate on my ears a little. I almost corrected her, but then I stopped myself. It didn't seem like my place, especially in front of other people. Everyone mispronounces words from time to time, and I wouldn't want to embarrass someone. Still, I wondered afterward whether I should have said something, or if staying quiet was the right thing to do. Would you correct someone's pronunciation in a situation like this, or would you leave it alone?