Yes, I've seen the Orange County Marriage Bond index with the 1814 date. I think it was just a typographical error, though I can't say for certain.
Wish I could help on these earlier BROWNS. I don't know if it helps, but you might have noticed that Sarah BROWN BOON is buried at Brown's Chapel Cemetery. The earliest (known) cemetery markers in this cemetery are two infant sons of George and Sarah who died in 1846, James W. died on February 19 and William A. died February 20.
The land for the cemetery and church was conveyed to the trusteees on February 21, 1834, by James D. BROWN. The trustees in 1834 included a Thomas BROWN. A Thomas BROWN Sr. is buried here also, born 27 June 1785, died 15 August 1862, and his wife Nancy Ann BROWN 10 April 1781 - 16 August 1862.
Maybe you can find a connection with these Brown's? Maybe there is a connection between James or Thomas BROWN and Sarah BROWN?