Flat-out wrong.
From your source:
Paraformaldehyde is a white, crystalline powder with the odor of formaldehyde that has been used for more than 30 years to decontaminate laboratory facilities and to disinfect sickrooms, clothing, linen, and sickroom utensils.
[...]
Until 1991, paraformaldehyde was also registered for control decontamination of laboratories and experimental animal facilities. However, all registrations for this use and many of the other uses described above were canceled due to nonpayment of registration maintenance fees by the manufacturer.
If they only had 4 sales in this area, it would not pay to have it labeled for this.
Okay...so there's no big secret here as to what's going on! It didn't require any exemption application until after 1991 cancellation...so of course that's when the applications start!
Note also, the quarantine use is separate from the Section 18 emergency use. You're seeming to conflate them.
Let’s take ten cookie jars and put 100 cookies in each jar. Now it is your turn to get us some cookies. How are you going to do it?
Huh?
The cookies aren't all the same recipe, so there are approximately 100 cookies, but it's unknown how many of each kind.
So tell me... how many were taken, if you don't know how many there were to start?
Come on.....I know you can figure this one out.
One can't, logically.
So what did the original documentation say from your FOIA, where you say it was 100 pounds, I think.