At noon today the invitation to join groups.io was accepted and transfer (copying of the group database) has been requested?.
When the transfer is complete, including membership profiles, all members who were successfully transferred will receive a "Welcome Letter". At that time replies to e-mails will be posted automatically.
Searching the list database requires access to the web site and a groups.io password (same for all groups.io lists). Yahoo passwords needed to access the YG website will not be transferred.
It took 5 days for the invitation letter to be accepted, it may make that long as well for the transfer to occur.