I started the claims process today, but I soon found out that the OUF needs proof of my old address in order to process the claim. So I started looking around the house and found a rent receipt from 1994! Who keeps documents from nearly 17 years ago?? Well, it's a good thing I do. All I have to do now is get the claim form notarized and mail that together with photocopies of the proof documents, and I'll see what happens in a few months. (OUF website says to allow 90 days for processing.)
One wrinkle in the unclaimed funds record is the OUF is not allowed to disclose the amount until I can prove that I'm entitled to it. So I have no way of knowing if this is even worth pursuing; it could be a few dollars or it could be hundreds. But I ought to get this done anyway, if only to tie up a loose end.