Custody Transfer envelopes for an inactive docusign account

I opened a support ticket with Docusign and they suggested I create an idea for a custody envelope transfer for an inactive sender account (employee left the company etc).  If I inactivate a sender, I used the custody search and am not able to locate the inactive users when I search by email or by name.  I know the user has envelopes from 6 months ago because I was able to search on a date range, but this is difficult to transfer all of them at once. So the work around they suggested is not inactivating the user until the envelopes are transferred.  I am not fond of keeping accounts active until the transfer can be completed.