Better Call Saul is the prequel series to Breaking Bad. Like that series, it is filmed in and around Albuquerque. It tells the story how Jimmy McGill comes to be known as "Saul Goodman", the lawyer who "put 'criminal' in criminal defense lawyer".
Mike Ehrmantraut is a retired police officer from Philadelphia. After moving to Albuquerque abruptly under suspicious circumstances (with a bullet wound), Mike works as a courthouse parking lot attendant in scenes shot here. Jimmy meets Mike coming and going from court as a public defender. Jimmy often doesn't have enough validation stickers and Mike refuses to let him leave without going back for more.
Later they start working together when Mike 'hires' Jimmy as his lawyer to help deal with Philadelphia police investigators who show up asking about the killing of two officers. The corrupt policemen were former partners of Mike's murdered son, and PPD officer, Matt.
Free parking is non-existent here at this dead-end behind the Albuquerque Convention Center (not a courthouse). There are metered spots very close by. The cache should be a quick Park and Grab with the hint, to save you time and money. It's a film canister a bottle-cap a duct-taped baggie medical centrifuge tube container ground level, next to post. Stand where you can read about the Aluminum wires, and reach behind (or walk the sidewalk above and look down). Please replace it back in there so it lasts longer!
Enjoy!
Grasshoppers&Ant