Did I lose my Retiree HRA funds from my former employer?

I'm a school teacher who had ~$4,000 in a HRA with a former employer – I stopped working there 12 years ago and I used to get paper statements in the mail occasionally showing an account balance but I never drew from the account. I haven't received any statements in a few years. I logged into the account recently and I see a zero dollar balance. I can see transactions showing my funds were sold early 2022. I am still a teacher but have been in a different district the past 12 years. Did I likely lose the money because I didn't use it quickly enough after leaving that job (and that district)? Do I have any recourse? The portal describes it as a "Contract Tied Retiree HRA" …. I'm in my mid-40s and not retired but I have not worked with that employer for about 12 years.