I was wondering What happens after used shuttlecocks in the All England, Yonex Japan open and etc are done with?
probably the same as shuttles used in local tournaments, they are given/sold to the clubs or used in programs offered by the national/state/provincial association. Thats the case here where i am when we have tournaments (yes they are not super series or anything huge) but the shuttles are then given to the provincial association at times and we use them when coaching some programs or some are given back to the club that hosted the tournament for training shuttles.
Maybe they are used for training? We have special shuttles for training (smashes etc. etc.), and good ones for matches, competition, tournaments.
The YOUHE brand do provide International Tournament like Super Series as the YOUHE S100 is BWF certified for International Tournament. They do provide club competition shuttlecock grade too. You can view at www.badmintontrade.com . tested it and it was very good for the price.