As far as I remember this conversation from last few times there is some stuff you may not be able to find on-chain…
Since 2023 when Remix Point stopped taking care of redemptions, unclaimed ADA is held in trust /escrow by Sawyers Holdings LTD. (Northern Ireland company I think, not sure).
At that time Lighting Communications Inc. was taking care of the redemption website and on-line support. They may be easier point of contact.
In this type of cases it is not uncommon to hold assets (or part of assets) in secured investment (like bonds) as to cover the legal cost, since holding company has duty to preserve the original amount of assets with out spending them on their services. This may be why some (or all) were delegated. I don’t actually know if this investment took place, this is just my GUESS by looking at usual practices of such companies.