Ford Blitz Restoration/Rebuild

[Private_collector]

Today I made a trip to retrieve some parts from a friends place. While there, I had the chance to look at a very complete Ford he recently brought back from Western QLD.
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The vehicles serial number is partly visible on both sides of the nose panel (much easier to see on one side) and also seems to be repeated on the bumper. I think I have correctly deciphered the last 4 of the 5 digits, but cannot make out the first. Could be a 5, 6, or 9. Can anyone help identify what it may be? NB: THE third photo shows the numbers after I drew my finger over them, to finish the missing sections. I'm fairly confident I have those ones right.
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Another tantalising clue to this vehicles provenance, is the definate HQ3 clearly visible on the doors. The truck has had very few layers of paint applied over the years, and it looks like a latter application of color has reacted with the original (I hope) signwriting, and caused it to come away in a manner quite different to the rest of the now peeling paint. I will show some more general photos of this truck in a following post. It's retains some items usually lost in time, or thrown away due to deterioration. I'm very excited about how original and complete this truck is. My friend did well with acquiring this one!
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The above photo is from the nose panel of another Ford CMP, vehicle number 56183. Is there any way to trace this vehicles history, and possibly the one at the top of this post. Alas, no chassis number has been found on vehicle '_4796'. It may yet be discovered, but my friend is thorough, and he says it's not there, he is probably correct. Looked in all the usual spots.