Where did this germ come from?

I have no idea where I caught this thing from... I'm functionally housebound, and the only person I come in contact with regularly is my aide.

She was down with a cold over a week ago (maybe two weeks), and I didn't catch any of her symptoms then, and my symptoms (Started with a sudden sore throat Friday morning, and runny nose, both of which quickly diminished, but were followed fever and headache soon after) are different from hers, anyway...

I did get a new delivery by UPS earlier in the week, which had been sitting in my room for a few days. And the package finally opened the Thursday night before bed...

I'm wondering if I could have caught something from an overworked warehouse employee who sneezed their germs all over the contents as they taped up the box... Although the box was not airtight, the packaging inside the box was.

Is't possible?

(I seem to have shed my "Ugh!" icon... If I had the energy, I'd make a new one. But my head feels like it's stuffed with shredded, soggy cardboard.)