This means that they have never been mounted in an album. The item "Scott # 2870 Recalled LEGENDS OF THE WEST Error Sheet in Original USPS Holder" is in sale since Monday, May 2, 2016. This item is in the category "Stamps\United States\Errors, Freaks, Oddities".
The seller is "retro_girl82" and is located in Parkville, Maryland. This item can be shipped worldwide.