Planning to sell this bed cover that had my truck I just recently bought, it is an extremely nice cover and extremely costly new around $1200.
I have the key and the lock works however it just locks closed one side, there is 2 hooks that lock the cover down and one side appears to come off at times thus the factor for the price.
This bed cover will certainly work on any 99-06 (07 traditional) silverado or sierra with a short box. It is still mounted on the truck for interested parties to take a look at and inspect function.