This keychain was available at The Company Store at Apple. The design is a rectangle with a black strap through the center and a silver key ring through the strap. The polished silver rectangle has a white Apple logo. The strap is 60mm long, while the metal rectangle is 40×28 mm. The keychain sold for $10.95.
This is one of several unique Apple-logo products that was available at “The Company Store @ Apple” located in the Infinite Loop Campus (in the 1 Infinite Loop building). When Apple began moving to the Main (“spaceship”) Campus at Apple Park in 2017, a Visitor Center was built near the new campus and The Company Store was closed and replaced by more standard Apple Store.