• Any hole greater than 5/8th requires disclosure
• Multiple holes (regardless of size) require disclosure
• Single holes less than ¼” do not require disclosure
• A disclosure for holes between ¼” and 5/8” are made by the auction inspector based on the affected substrate (corrosion, damage to the substrate) and location (close to striker etc).

A good rule of thumb is anything larger than a dime. See the guide below.