Travel that includes multiple flights
If your trip includes more than one flight on Alaska Airlines and/or one of our airline partners, we will check your bags to the final destination on your ticket as long as there are fewer than 12 hours between flights.If you will be in the connecting city for 12 hours or longer, you will need to claim and re-check your baggage. Additional baggage fees may apply.
Ouch. I would send the storage bill to AS Customer Care, with a lovely screenshot of its web page, as there are no restrictions posted, such as sunrise, sunset, eclipse, anything turning into a pumpkin hour, moon hits your eye, and so on.
On second thought, I'd send the bill and complaint to an executive, as you're likely to get a response as meaningful as a canned reply to a PDB issue from Customer Care.