Try and find these in stock at any supplier...I got them here, ready to ship! Wiremold trench duct end caps VA12W325HEC lot of 5 new.

Its for 3.25” deep and 12” wide.. brand new w screws and adjustable for different floor finishes

Original cardboard box (shown in main picture) may or may not be included in shipment, depending on whether it fits into my flat rate box or not, thank you have a great day