Hi Duncan
I asked over at the Maple Leaf Up Forum (when I thought it might be a vehicle related) and a member has demonstrated that it is the lid or part of the crate for a Field Cooker or Stove.
Quote:
...J2 is the Vocabulary of Army Ordnance Stores section for portable cooking equipment, JA73 is the prefix and first two digits of the stores code.
...So it would be J2/JA.73nn followed by the description...
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He linked an earlier VAOS that shows slightly earlier numbers than the model in the photo.
http://www.essexhmva.co.uk/education...%20Cookers.pdf
Now as to "Where", I can't help you. I lived outside of Mons for 5 years and my house didn't look like that.
regards
Darrell