As long as they don't have an audited central database of all viruses that they sequenced, they have no way to demonstrate that they showed you all of their virus lines.
And if they had such a central database, we'd have probably heard about it by now.
>>btilly+(OP)
I'm not sure about the "audited" part, but the WIV did have such a central database. It went offline in September 2019, they say due to repeated hacking attempts. It hasn't been back since, and access to that database has been a major point of contention between those who believe a forensic investigation (i.e., one that doesn't simply trust the WIV to report whether they were working with related viruses) is necessary, and those who do not.