It sounds like this is your area of study? What do you think?
Only kinda: I'm a microbiologist, but I work with environmental bacteria rather than deadly viruses.
To be honest the whole "alerting border agents to keep an eye out" is probably just a general precaution, I doubt it's something to massively worry about. I'm more interested in the random vials of smallpox found in an FDA freezer the other day.