FYI, The Qingdao is registered in Malta and owned by French shipping and logistics company CMA CGM. It was bound for Norfolk, Virginia at the time it lost power.
I thought APL was a Singapore company, unless they have split up some more. They have undergone some restructuring in the last few years. They used to do trucking, but I don’t know if that has changed.
I'm pretty sure you know this, SeekAndFind, but for others, registration, flag, ownership, captain, crew, etc. is completely immaterial.
There was an interesting article in the WSJ several years ago about what happens when stow-aways are found. It's a real headache for the Captain, because he's most likely going to call on several countries, and doesn't want to convert a berth into a brig. Generally, they tie them to a pallet and cast them overboard. In a few cases, they use the bound stowaways for target practice. It's just too difficult to figure out who has jurisdiction.