This is where the absolute tragedy of the 'x'ed textures is documented.  RIP marblewall.
I will also note any textures that have non-'x'ed versions available in other games/directories.
Last updated 5/28/2017

-CrazyBubba64
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metal/metalhull006b_normal

models/props_c17/furniturewood001a
models/props_c17/furniturewood002a
models/props_c17/furniturewood003a
models/props_c17/handrail01a_bottom
models/props_c17/handrail01a_level01a
models/props_c17/handrail01a_level02a
models/props_c17/handrail01a_middle
models/props_c17/handrail01a_top
models/props_c17/handrail02a_bottom
models/props_c17/handrail02a_middle

stone/marblefloor003a
stone/marblefloor003b
stone/marblewall001a
stone/marblewall001b
stone/marblewall001c
stone/marblewall002b
stone/marblewall002c
stone/marblewall002d
stone/marblewall002e
stone/marblewall003a
stone/marblewall004b
stone/marblewall004c
stone/marblewall004d
stone/marblewall004e
stone/marblewall005a
stone/marblewall005b
stone/marblewall005c
stone/marblewall005d
stone/marblewall005e
stone/marblewall005f
stone/marblewall005g
stone/marblewall005h
stone/marblewall005i
stone/marblewall007a
stone/marblewall007b
stone/marblewall007c
stone/marblewall007d
stone/marblewall007e
stone/marblewall007f
stone/marblewall007g
stone/marblewall007h
stone/marblewall007i
stone/marblewall007j
stone/marblewall007k
stone/marblewall007l
stone/marblewall007m

stone/stonewall023b
stone/stonewall023d
stone/stonewall026b  :  REPLACEMENT PRESENT IN LEAK AS glass/glasswindow066g
stone/stonewall026e
stone/stonewall026f
stone/stonewall026g
stone/stonewall029e
stone/stonewall029e
stone/stonewall029f
stone/stonewall029g
stone/stonewall029i
stone/stonewall029j
stone/stonewall031b
stone/stonewall031c
stone/stonewall031d
stone/stonewall031e
stone/stonewall031f
stone/stonewall031g
stone/stonewall031h
stone/stonewall031i
stone/stonewall031j  :  REPLACEMENT PRESENT IN RETAIL CS:S AS stone/stonewall031j
stone/stonewall031k
stone/stonewall031l
stone/stonewall031m
stone/stonewall031n
stone/stonewall038c