Assuming no malpractice.
Personally I'd just leave things alone and be careful.
Was the incapacity date on a COP3 or something else?
Where any outgoings by a previously signed DD?
If not DD or similar how where they authorised?
I think the legal position is that you should pay from your own assets, keep proof, and reclaim as deputy.
Again, assume no malpractice, why alert the OPG/COP to a potential witch hunt?