Right. So here you go:
in depotlocker.cpp, line 25, change this:
Container(type, 2), depotId(0) {}
to this:
Container(type, 30), depotId(0) {}
and in player.cpp, line 703, comment out this (or just remove that line):
depotLocker->internalAddThing(inbox);
I didn't test it, but this should...