Coolant Leak - Need 2nd Opinions

[Spannerhead]

Hi guys. New here. Working on a coworker's '02 Tiptronic Boxster S, trying to track down a coolant leak. I've already replaced the water pump & thermostat (pretty straightforward), but there's a leak that's dripping from the corners of the splash tray, more so on the right side. See below:



All the hoses above it are intact and dry from what I can tell. I removed the forward rear fender liners, and there's coolant on this brace, both sides:



I removed the engine top cover, and firewall access panel behind the seats, no leaks.

Then I removed the trunk liner and saw this:





(yellow is old coolant, red is newer coolant)

The tank is leaking, right? If so, how does the coolant make its way down on the chassis braces in front of the rear wheels? And over that far to the left in the trunk?

Any input welcome. Thanks!