Sort of!! Out front of Union Station there is a van at the corner of Wynkoop & 17th St, that will hold your luggage. I know it sounds odd but it’s totally legit and it lets you walk around (if you have time to kill) without your bag. Sorry I didn’t catch the name on the van (something like Luggage Locker?) This was a Thursday morning when I noticed it, so I’m assuming they are there during normal hours?
In my experience, most facilities give you 48 hours to have the unit cleared out and left in a “broom clean” condition (i.e. swept out). If you don’t get your stuff out, of if you choose to cherry pick a few items and leave the rest, then the facility can reclaim the locker and it would most likely be auctioned off again. You’d also most likely be banned from participating in future auctions held at that facility, or run by the auction house you dealt with. Lockers Denver Colorado