Yeah - I lost one of mine this year, dry flies gathered over 20+ years.
A few positives:
* Famous Grouse kindly pointed out the wisdom of writing name, address in permanent marker. I've done this on all the remaining boxes. Strongly recommended
* I have also taken photos of the contents of the other boxes
* When I was going through the patterns I needed I realised that some patterns had been lost over time and never replaced - step forward Tups Indispensible for example.
* A very kind young fellow from the forum (step forward and be embarassed Fishcake

) took pity on me and tied me up some cracking flies (he fishes round here so knows the patterns - included some new ones I never had). He wouldn't accept anything for them, so I made a donation to a fishing charity of his choice.
* It gives me the excuse to make more visits than usual to the brook where I lost it of the "I'm just going to have another look for that lost fly-box dear" variety.
Having said all that it's still as bad as a kick in the b*lls...but I have had a couple of good fish on the Tups that is now back in action.