Roman coin wanted - serious collectors please

Dear fellow collectors

I am on the verge of completing a collection of all the ancient Roman
coins of each and every emperors. I am down to my last 2 emperors.
Has anybody EVER seen a coin of the emperors Glycerius and Olybrius?
The alleged Glycerius on wildwinds.com is a gross misattribution of a
commonplace Honorius, and I have never seen either a Glycerius or an
Olybrius for sale - not in any of the major auction houses, let alone
on e-fake i mean eBay.
If anybody has any information about where or how I might obtain these,
I would be greatly appreciative.

Ewan