If you can't find it, I see two potential choices.
1. Call Jim Combs and see if if he still has his. It's probably a longshot, but worth the call. The next closest RV-10 is probably Wayne Gillispie in Portsmouth (he lives in Ashland). I don't think I have mine.
2. Order one from Vans and have it shipped priority mail. It should fit in the small flat rate box, so it should cost under $10 and you'll have it mid week.
Trust me, this won't be the last part you'll misplace. They always seem to reappear the moment after the replacement arrives.