Found the following hamletworks.org entries referring to line 2987-8

View Commentary Note for 2986-87
2986-7 {Hor. } Horatio, when thou shalt haue ouer-lookt this, giue these | fel- 

View Material Textual Note for 2986-87
2986-7 {Hor. } Horatio, when thou shalt haue ouer-lookt this, giue these | fel- 

View Commentary Note for 2986, etc.
2986-7 {Hor. } Horatio, when thou shalt haue ouer-lookt this, giue these | fel- 

View Commentary Note for 2987-89
2987-8 lowes some meanes to the King, they haue Letters | for him: Ere wee 

View Material Textual Note for 2987-89
2987-8 lowes some meanes to the King, they haue Letters | for him: Ere wee 

View Commentary Note for 2987, etc.
2987-8 lowes some meanes to the King, they haue Letters | for him: Ere wee