Didn't they have a power outage a bit ago too and lose a bunch of breeders?
Not to go way off topic or anything.
I would imagine that getting enough rats to jumpstart an operation as large as theirs necessitated purchasing large numbers of rodents from multiple sources and if they just had them shipped in, didn't go get them in person, there is no way to really know how they were kept.
Anyway, this is not about them in particular. We should keep that in mind.