Wash it of course. Drive it all day on errands. Then added my first aftermarket part.
I read all the frame end cap threads and looked at all the aftermarket ones available. I didn't want to spend much money. So I went to Home Depot and got two 3" galvanized pipe plugs. Just stuck them in the hole and turned the wing nut. They look like billet pieces unless you crawl under there and look close. They are easily removable to check for moisture buildup. And they were $3.25 each.