Chris, I don't know why you install is giving you the wrong info in the properties list. Sounds like something is wrong. The following will give you the items with the same stroke selected so you can work with them.
---------begin
tell application "Adobe Illustrator"
tell current document
tell layer 1
set theList to every page item of it
repeat with k from 1 to count of theList
if stroke color of item k of theList = {class:CMYK color info, cyan:0.0, magenta:100.0, yellow:100.0, black:0.0} then
set selected of item k of theList to true
--display dialog "hey"
end if
end repeat
end tell
end tell
end tell
--------end
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