When searching a kuid only enter the two middle bits. There is no such thing as <kuid2:328583:1199> It is <kuid2:328583:1199:X>. In any case, to search that kuid you need to search 328583:1199.
Now we need to know which version of Trainz you are using. I find Content Manager (from TS06 up) unreliable for searching specific kuids you will have much more luck if you search the old 'black page' DLS here http://www.auran.com/TRS2004/DLS.php
Just make sure you have all the version boxes ticked and the radio button for 'KUID' immediately below the search box...