tygerkat I applaud your resourcefulness for obtaining permission, and I fully agree with the "stupid police" comment *even if it was slightly wrong in a small fit of rage* If MPD had been in contact with all resource's this incident would not have gone so far.
On the other note, I do think a smaller container should have been used and something of an alternative color used. even if duct-tape was used to match the color of the GR, it was an obvious choice for an Altoids tin which would be disguised even better than a small lock & lock.