Upon Arrival:
→ (1) handy-dandy journal, which Murphy keeps notes in (i.e. maps and random thoughts)
→ (1) lighter
→ (1) green, buttoned-up long-sleeved overshirt
→ (1) dark blue "Route 95" hoodie
→ (3) t-shirts (black, white, and red)
→ (2) pairs of jeans

In Game:
→ (1) shiv [handmade]
→ (1) handgun [from John Tillman → probably given to Heather Mason by now]
→ (5) little blue birds, Jory, Luwin, and Mordane (names courtesy of Alayne Stone)
[Update: 2 of the 5 birds died]
→ (1) hard copy of the following (10) books:

→ One Flew Over the Cuckoo's Nest by Ken Kesey [donated to the library]
→ To Kill A Mockingbird by Harper Lee [donated]
→ The Old Man And The Sea by Earnest Hemingway [donated]
→ Kafka on the Shore by Haruki Murakami [donated]
→ The Music of Dolphins by Karen Hesse [donated]
→ Go The Fuck To Sleep by Adam Mansbach
→ Adventures of Huckleberry Finn by Mark Twain [donated]
→ two anthologies containing the complete works of Grimms' Fairy Tales [donated]
→ King James Bible

→ (1) canvas sack; heavy and smells really bad... hmm, kind of suspiciously like a body was once inside
[Update: Murphy is currently in the process of trying to dispose of the canvas sack the sack was successfully disposed of when Murphy had airlocked it in attempt to also get rid of his mask]
→ (1) small, old-fashioned gramophone with some familiar tunes to go with it (more notably: Louis Armstrong, Andy Williams, Frank Sinatra, Tom Waits, Leonard P. Breedlove, Nina Simone)
→ (1) fishing net and crow feather [from Annie Cresta]

Stolen From Strela Outpost:
[Note: With the help of Dave Strider's unlimited inventory, Murphy was able to take a lot more than he could carry from the outpost.]
→ Several clothes (most which probably don't even fit him, actually)
→ A lot of scrap metal (for the chapel)
→ (1) toolbox
→ (1) electric cattle prod
→ (2) buckets of colored paint
→ (1) box of chalk, though the color blue is missing

Acquired From The Silent Hill Plot:
→ (1) orange-red prison jumpsuit from "Overlook Penitentiary"