What type of things do you keep in your owners locker? We do fly, but we fly Southwest so it’s easy to check bags. But I am curious to learn more about Owners Locker.
I travel a lot, so most of it is just what I always pack. Toiletries, pajamas, night light, white noise machine, medication, contacts, extra glasses, chargers, hairbrush + tools, hairbands
Some of it is Disney specific: Brita filter, swimwear, flip flops, beach bag, glowstick things, Disney bubble wands, ears, sunglasses, hats, tape, scissors, laundry soap, dish soap, Disney ponchos, my well-worn Disney sneakers, a small blanket (which gets used constantly), the kitchen knife I like.
Most importantly for me, a nice robe. Most $700/night hotels already have nice robes, but not DVC.
You put the contents on the website (privately) so you can see what you have already. This takes my packing down to a couple days clothes in a small backpack. EASY. It's also already waiting for you at Bell Services, so you don't have to wait for Magical Express to bring your bags four hours later, while you are trying to go to the pool now.
They pick up and drop off at anywhere I would be willing to stay. So, you could also stay that first night off-brand at Disney Springs to avoid paying an extra Disney night, and you just bring it with you in an Uber. I always split stay and it's a non-issue. Disney is very used to dealing with Owner's Lockers. Mine is covered in large Vampirina stickers, so if you see that one, say hi!