This is an insert for Resurgence ( https://boardgamegeek.com/boardgame/340897/resurgence ), a bag-building / worker placement board game by Stan Kordonskiy.

The insert is intended to be used within the cardboard insert that comes in the game box, and should accommodate sleeved cards. The parts should fit together fairly snugly, with the main board stacked immediately above them (followed by bags & player boards) to 'lock in' the pieces.

Because it was designed to fit in the existing cardboard insert, not all the rubble tiles fit in the designated rubble container. As such, 3-5 rubble tiles will need to be stored in one of the extra slots built into the design (or in one of the deck slots, if you'd prefer to combine some of the smaller decks).