J.F.
Hey K.,
I'd just throw it out and be more careful next time you find something on craigslist. Usually its an awesome place to find things, but sometimes not so much. We just bought a swing not too long ago and didn't realize til we got it home that the tray was missing. When we tried to re-sell it no one would buy it for that reason. Now I go to Once Upon a Child to get baby/kids stuff. Their stuff is inspected and certified so you run into way less problems. I hope that helps. :)
blessings,
J.