In the end, QuietGaming claims he was able to fit 100 dead policemen inside that damn phone booth (he could have probably gotten 1,000 had he opted for clowns). At this point, he did what any self-respecting criminal would do and blew his little art installation to pieces with explosives.
"Someone call the ... oh. Ohh."
Many other YouTubers soon followed in QuietGaming's footsteps. Watch this one patiently place over 50 corpses inside a booth, make it go boom, and then throw about a dozen more bodies to the somehow still rectangle-shaped pile. (Although one was a minor, so maybe that was cheating?)
Also, he apparently chopped off some of their heads to optimize space.
This other one confirmed that the phones are still usable in this state when a soon-to-be-dead witness tried to call the police in the booth/graveyard.