One or two suggestions for you guys. Since this box is going to be all your work, there is no reason that you should follow the rules we have on the US box. The idea of replacing items with similar value might be a hang-up. If you can get someone to accept shipment, keep something if they want, and put something back if they can, then ship to the next recipient that might be good enough.
Again, if knives are going to be a problem, there is no reason that you couldn't make it a box full of accessories. Paracord items, sheaths, watches, pens, flashlights, or any other EDC type items. You get to make that decision (along with all the others) by yourselves. I would think 10 members might be enough to start the box rolling. After it begins moving around, perhaps others will decide to join in.
Our rule about not saying what was in the box when you got it, and not saying what items you put back in is a good rule, I think. Also the taking a photo and making a post of the items that each recipient kept is a good one. Helps popularize the box and keeps people interested. You are making a pretty good start. Best wishes. G