I wouldn't be worried just yet. He's middle-aged, his metabolism isn't as fast as when he was a growing youngster, and he had a huge meal recently.
My adult milk/king snakes all are on a 10-14 day feeding schedule over the warmer months, and a few won't eat while in shed so they'll miss a meal periodically. Plus over the winter while I don't brumate them, they sense the season change and back themselves off to feeding every 3-4 weeks. I would give him another week and offer a smaller feeder, just to see if he's interested.
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