What do you do in such a scenario?
What I would do, and what I do, is avoid finding myself in that situation.
The only real solution to your problem is having backups in different places. If your plan doesn't spread across different areas and need several things to go wrong before it fails, it's not a good security plan.
That's right, although he's talking about someone who is residing illegally in a country, and in that case they won't have several properties where they can store multiple copies of the seeds, because they can't legally buy real estate to begin with. But even in that situation, you always have to have a backup plan just in case what the OP describes happens to you.