How can foods be in but not be in the MFP database?

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This week alone I've been unable to find calorific values for two Slimming World dishes, scotch eggs and spaghetti carbonara on MFP, but when I Googled "How many calories in Sliming World..." the top answer for both was MFP!
However, even when I copy and/or cut and paste the meal description onto the MFP search nothing shows up for it? Anyone any idea what or why that happens? Thanks

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