Read this order
Letter → Fox: A work document or a message that may be misleading. Check the terms before assuming the wording tells the whole story.
What changes in reverse?
Fox → Letter: Work-related paperwork, or a message whose wording deserves a careful check. The question decides which emphasis fits.
Fox → Letter ↗A practical example
A job offer with conditions in small print can fit the work-and-paperwork reading. If your question concerns a questionable message, careful checking may be more relevant. The pair itself cannot establish fraud.
Check it against your question
Keep the actual order and ask which part of the example fits your situation. An example illustrates a possible reading; it does not establish facts or promise an outcome.
The meanings behind the pair
Letter: Letter is a written message, document, notice or record. It draws attention to the information itself and to how it has been communicated.
Fox: Fox calls for caution around appearances and self-interest. In some Lenormand traditions it also represents everyday work or employment; that reading is most useful in a work question.
These examples show possible ways to read the pair. Your question and the other cards may change the meaning.