I've never had to wet age a brisket but I've purchased any grocery store Briskets yet. I usually get them from high quality butcuers and reputable online butchers shop pre-aged. Some site will allow you to request a 45 day aged special order.
My concern with wet againg a Costco brisket for example would most of the people working there would not know how long the beef had already been aged.
Super fast Red Themapen, Weber Platinum, Kamado Joe Big Joe, Maverick ET-732