Origen, and Clement were kind of squishey, wobbly, almost gnostic turkeys, but they did gather lots of manuscripts in the persuit of trying to support their gnostic leanings.
I think you ought to rethink this. Origen may have held Platonic heretical positions, but gnosticism was not one of them. His writings were largely to refute gnosticism.
Clement is not much different. If you are referring to St. Clement of Alexandria you will find his works were not sympathetic to the gnostic heresies. If you were referring to Pope Clement I he compiled no codices and very little of his writings survive. There is only one reference to the Gnostic's that I am aware of in his 2nd Letter to the Corinthians and it isn't flattering of them.