The build code would still be XX7 or XU3, but the white decals was the white decal option code.
I doubt Brisbane would have stamped XY5 instead of XX7 or XU3, because they were still XX7's and XU3's
I have seen order sheets for HJ Sandman's that request XX7 then the words White Decals noted in the comments section, and also with XY5 ticked.
Attached is a screenshot from the HJ Options book I have.
Capture.PNG
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