Found the following hamletworks.org entries referring to line 1846-7

View Commentary Note for 1846-47
1846-7 Madnes in great ones must not {vnmatcht} <vnwatch'd> goe. | Exeunt. 

View Material Textual Note for 1846-47
1846-7 Madnes in great ones must not {vnmatcht} <vnwatch'd> goe. | Exeunt.