The 7th stage in Stray is called Dead End. Our collectibles guide explains where to unlock 3 of B-12's Memories. This will bring you closer to reaching 100% completion in chapter 7.
Menu location: row 2, position 11
Collectible description: You'll find this collectible at the very beginning of the stage, before the title card is displayed. After meeting with Momo in the slums and entering the new location, go straight ahead. Once you've reached the fork, turn left. You'll find the memory at the large gate.
Menu location: row 2, position 12
Collectible description: At the beginning of this chapter, you have to complete the zurk chase and make a long jump, which will temporarily hurt you.
Going further, you will come to a fork; pick the way straight ahead. Eventually, you will arrive at the hole in the fence.
Turn right and you'll have no problem spotting the collectible you're looking for.
Menu location: row 3, position 1
Collectible description: This memory is in the building where you met Doc. Explore the building before solving the puzzle. Find the mannequin with a bucket over its head.