Psyonix additionally declared changes to the Trade-In framework when Blueprints are added to Rocket League. It'll "cripple the capacity to utilize paid Rocket League Trading substance" in the Trade-In framework.
Anything from Blueprints, the Item Shop, or Crates won't have the option.
to be exchanged once the update goes live. Free post-game Rocket League Item Prices drops will in any case have the option to be exchanged.