Well I haven't had any activity on the give-away quiz for a few days now, so - since I am in for a busy weekend - I decided to close a day early. Thanks to everyone who sent an estimate of the original value of the trees in the boxes. One slight shock was how unfamiliar and illogical the old British currency seems now.
There are 107 individual fir trees in the boxes - you probably can't quite see all of them, but I was looking for an estimate. I know it is 107 because I had 85 good trees and recently I obtained an additional 22, and also I can confirm that the number of magnetic patches I attached to them is 107. And, of course, I counted them again, to check. That should about do it.
107 trees, at 6-to-a-box, is 17-and-five-sixths boxes, which, at 3/11d a box (that's three-shillings-and-elevenpence, or 47 old pence a box), works out at close to £3:9:10d - that's three-pounds-nine-shillings-and-tenpence - or £3.49236. I did not bother to work it out in contemporary Mars Bars, since no-one seemed interested.
Best cost estimate came from Ross Mac, who doesn't want the prize and is therefore a Category B entrant (glory only). Ross's estimate of £3:3:7d was based on 16 and a half packs - 99 trees. If he had done the cost calculation more accurately, I think he'd have got £3:4:8d, which would have been even closer, but no matter - well done, Ross, the glory is yours.
The nearest estimate from Category A was Mark Dudley's £3:2:8d, so he wins the Lachouque booque (or Lachook book if you prefer). Mark - if you send me a comment (which I shall not publish) giving your postal address I'll get your prize to you.
Goya observed that, around 1960, when these were bought, three-pounds-something would not be far away from the average weekly wage of a manual worker supporting a family. Discuss...
Thanks again, everyone - them sums are harder than I remembered, man.