The Order was founded in 1815 to reward both British and Hanoverian citizens for distinguish services to Hanover. In 1837 the order passed to Ernst Augustus, King of Hanover, after which it became a purely Hanoverian award.
Statute XXV of the 1815 Statutes of the Order of the Guelph states that “…at the completion of the act of reception [of the insignia], every Grand Cross, Commander and Knight shall receive, from the Chancery of the Order, his patent of appointment…” However it is noticeable that no such patents have come to light for the period 1815-1837, at least as far as I am aware.
The only paperwork I have seen in relation to this Order is a transmittal letter enclosing a badge of the Order, dated 1831.
