From his MLBlog "Baseball Nerd":
A poster gave the real reason:
"There was a play running off-Broadway (and later elsewhere in the country) a couple of years ago called '27 Heaven', based on the imagined conversations in heaven of some of the members of 'The 27 Club' (famous rock stars dying at age 27): Jimi Hendrix, Janis Joplin, and Kurt Cobain. While pulling the car out of mothballs and parking it may be some kind of statement, at least the paint job is explained."
As far as the coffin goes, Stay Classy Yankees Douchenozzle Fans. Phillies fans would never stoop to such lows.