Interesting question. I got the impression from reading section 3 that an FFL could transfer a firearm without a VSP background check if the VSP informs the dealer that VSP could not complete the check by the end of the dealers next business day.
Thus, if dealer complied with the identification requirements in subsection 1 and the VSP notified the dealer they could not meet the next business day requirement, then the VSP may not have performed a background check and the end of week requirement would actually be the first VSP background check.
Using that chain of possibilities I can envision section 4 as a final backstop to ensure the VSP have the opportunity to perform a check after the transfer and the notification of the local law enforcement as the enforcement tool.
That's all I could come up with that made sense on a Monday at 10:00 PM....