Letting it rip

Logic Level 3

Chin-ying Nehowakizuki got angry while trying to read the AoPS Intro to Algebra textbook, so he ripped several consecutive sheets out of the book. The smallest number on any of the sheets he ripped out was 385 and the largest number is known to be written with the same digits but in different order. How many sheets did Chin-ying Nehowakizuki rip out of his beloved textbook?

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