Sometimes, that "Murphy" can be such a jerk! Sorry for your spat of bad luck. Maybe it was just bad luck? I would think the overspray would chase them little buggers off... but who knows?
I used to spray outdoors, and yeah, that has happened to me as well. But at least it was the exception. I used to spray off the edge of the deck, then walk back inside between coats. Verrry careful not to kick up dust, works best when no one else was home.
So, a lose part blew off? Can you attach them to something with weight? When I spray, I use a stand made from the old style cloths hanger, with the cardboard tube removed. Dremel off the tip of the hook, and spread the two wires to form "feet". A nice, heavy vice grip forms the third leg of the tri pod paint stand. Can you use a vice grip to weigh down the base?