Well, I did respond to my PWC proof of debt request for my CTs in March 2024 and received some feedback from PWC:
Hi,
Hope this email finds you well. We checked that you are not on the direct mailing list from LBH, but it is possible LBHI has been forwarding the announcements we have been sending. If you receive any further notices please let us know the return address(if any) that is written on the envelope so that we can confirm the sender.
The envelope does not have a return address on it.