I don't know the answer to that question. I believe there was a process.
I know there were some concerns with some of the envelopes. Elections BC was able to reassure people that they were aware that some of the envelopes had become sealed before they were received by the voter. There were concerns that they would look like they were tampered with. Elections B.C. was able to address that issue.
I don't know if they can tell an individual whether their individual package was obtained, but they do have a process that's quite rigorous to ensure that somebody doesn't vote twice. If you voted on voting day and then a mail-in package...they can make sure that doesn't....