Awesome! Here's a walkthrough (SPOILERS WARNING):
click on corpse head, use a pipe to prop it and scan with ur eyes to open hatch.
Back in 2012, take coins in a car, buy boomerz from homeless guy, go to garden, click on right side of wall iron thing. Once opened, go to well, click until east faces upwards and second dial click right 2 times. Put boomerz into well. Go to house, go upstairs, click photo august 4th 2012 translates to 8412 for the chest. Chest opens, take either the police badge or the multi-tool. Go back to justin's apartment. Depending on what you took, you can end the game using 2 different ways (ending is the same though).
1.If you took badge, show it to apartment 71's Steve. Click on left side drawer's desk top's paper. Take the key and open room 72. Game ends.
2.If u took multi tool, go directly to room 72 and open door. (or click room 71 to gain extra "Logos" medal.) Game ends.
I'm also the ashkalis user btw, asking to delete a review takes too long, hope this helps you guys :)