Nothing about contacting the ISP to 'verify' there. Maybe the little disclaimer off to the side is meant for it.
Maybe you're supposed to call? There is no number listed anywhere though. The super secret FFL dealer number though is 866-752-1246. Option #2 is for 'Non-FFL's from what I understand.
After much searching, an actual page was found. Under 'Firearms', tab to FOID then scroll down to 'Person to Person Firearm(s) Transfer'. Scroll down to "Check FOID Card Status for Private Firearm Transfer". There is a section there for entering the FOID number, DOB and CAPTCHA code. Interesting to note that the both the drop down and area to enter the info is below what most phones/tablets would display. I'm sure that wasn't intentional.
So there ya go. How to follow the law that has no penalties for not following it.
I don't know if it works as I have not used the system yet.
I don't know if it works as I have not used the system yet.