Thank you both. The bill must have gotten lost in the mail.
I have my prior year mails, from which I can confirm my contract number the same as mrharris indicated. Thank you for the bill number. I've paid by flywire before, so that's enough information to pay it. I'm just reluctant to do so without an actual bill. I suppose I'll call the Finance Dept, which number is also on the old correspondence from the Craigendarroch Owners Club. Thanks again.
ETA - also curious that the HGVC web site is not showing a balance due.