Dear detective tapes

The Dear detective tapes are a series of four holotapes in Fallout 4. They are left there by a ...

Location
This holotape can be found in Fens street sewer, and can be seen right when coming down the ladder from the street. Parts 2, 3 and 4 are also in Fens street sewer.

This holotape can be found in Fens street sewer, on a barbecue next to a skull. Parts 1, 3 and 4 are also in Fens street sewer.

This holotape can be found in Fens street sewer, on a table next to a green/yellow chair in a room with a mannequin, candles and various crates. Parts 1, 2 and 4 are also in Fens street sewer.