Hi 123zaz,  It is absolutely your call whether you want to give away the OEM and upgraded hardware and other software discs along with the system. They will be able to use it, if they want to.
This is probably a really dumb question .    I'm giving my old Dimension 4300 (from 2001)  to Goodwill minus the HD.  Everything else in it still works well.  I have all original documentation, manual & discs for all the hardware I upgraded.  Should I also give Goodwill the Dell OEM Windows XP install disc and the SP 2 & 3 discs I have?    Will they be able to use them?   Thanks for your time.
Give OEM install disc to Goodwill?