Quoted from NYP:I'm looking for the right side triangular insert on Avengers Infiniti Quest
Given that the game came out pre IC, and if this is anything like similar comments in the Deadpool thread, the only way you can get that is to buy a complete plastics set which is brutal. Someone in that thread reproduced this art but that seems sketchy with copyright if one ever intended distributing them.
I would encourage anyone looking for a replacement/cover-up to contact their distributor and even Stern to ask them if they intend on making good on what they said they would provide "to cover up the scanner if an operator so desires." as mentioned in the initial rollout. Scroll up a few posts (#3370) and there is a link to a Tilt Forums post that details all of the initial reveal info.