Hello from Raunds. There was a Quaker Meeting House in Thorpe Street, Raunds, although the cottage where meetings were held was sold in1873. Meetings ceased there in 1834 and it was demolished in1880.
It did have a small burial ground which still exists, although I don't know how to access it. I don't think there are any MIs though. I know I shan't be able to do anything this week, but I will try the Council offices to see if I can find out anything in there.
I have looked in my book of Raunds MIs (C of E and Wesleyan) and there are no Gilbys mentioned.
Regarding the second of Seahall's links to the NRO document, may I draw your attention to page 7 item155, which I think may answer your question, so you might be able to find out by contacting the NRO.