That batch came from a large non-chain pet store. They were out of both large and medium rats, so I ended up buying 1 XL rat, 5 small rats, and 6 mice. All the rodents looked healthy, and they were all eaten.

Also, the morph of the snake is unimportant to the thread, so I left it out, but she's a butter, and definitely X-gen captive bred. I know that doesn't rule out internal parasites completely, but it's far less likely in her than in a WC.