I've fed many a highly stinky f/t rat to mine and never had an issue, but it was always the same rat smell that I've smelled in a room full of live, healthy rats. I think it's gross, but he is usually more excited for the stinkier ones. The feeders always looked just fine, and if it's a bit of rat urine - well, they're already eating the contents of the bladder and the gut so why should a bit more make a difference? If it looked dirty, that would be a different issue, but eliminating during death is a natural process so I don't fuss much.
However, as I said, he was always very happy to take them and I could reasonably identify the smell (I can identify various animals by the scent of their urine/feces at this point, have had lots of practice - not my favorite skill, but occasionally useful I guess.) . Since your snake rejected yours, you might as well accept the snake's judgment on them - they're better at identifying odors and the cost of some f/t rats for one snake isn't very high for peace of mind. Tossing them and getting new ones is your best choice here.
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