If you really want to have fun with your distributor, ask him about controllers that show up in the RSLinx Enterprise hardware menus. Evidently the software authors worked from a list of possible hardware part numbers and ID codes. There are 8K 5/05's on that list, and 1747-L20's with Ethernet, and other stuff that is possible only by playing Scrabble with part number codes.
As far as I know, the "1747-L533" is in that category of "possible part numbers but never built" controllers.
Out of curiousity, would you have a use for a 32K SLC-5/03 controller ? Would you want DH485 on it, or would two RS232 ports be better ? Could you use Modbus Master/Slave onboard ?
Those are all discussions that come up when SLC designers drink beer, but those discussions end either with "how many would be sell compared to what we have now" or "hey, we're out of Leinenkugel."