The sorting discount
Mixed lots are priced with a handling allowance for identification, weighing and separation. The discount is usually larger than sellers expect, and it disappears when the pallet is sorted.
Sort by three things
Construction, metal and footage band. You do not need exact numbers to separate THHN from tray cable, or copper from aluminium, or full reels from cut-offs.
List what is on the pallet
A short manifest per pallet — even approximate — converts a mixed lot into a described lot and moves the price toward the sum of its parts.
When to leave it mixed
If the pallet is genuinely unidentified short cut-offs, sorting adds cost without adding value. Sell it as recovery material and move on.