Correct identification of ICs LTC2447IUHF or LTC2447CUHF

Welcome to the Digikey tech forum. I see from the datasheet the part marking is the same 2447 for both parts . The footnote lists , “The temperature grade is identified by a label on the shipping container” . It doesn’t look like these can be identified by part markings , you don’t by chance still have the manufacturer boxes for both parts with some parts still in them, that may be your only option to separate which ones are the C or I version.