Lender's appraisal- can we challenge it?

[Svetlana G.]

We just received lender's appraisal on the  property we area selling. While the market is very hot in our area and houses are moving quickly, I am puzzled why comparable houses (number of bedrooms, bathrooms,  total sq. ft) that sold within the last 2-3 weeks were not included in the report, while those that sold almost a year ago are included.  Has anyone challenged appraisal, on what basis and was it successful?

Grateful for any insight you may provide!