They appear for me on the 20th also,
As for the scouting, you could do what I do which enables me to scout all the new youth player intakes in Brazil in about 5 mins.
Go to a clubs in Brazil and go to the under 20's tab which shows all the youth players, and click scout team. Then use the little up and down arrows next the club crest in the top left corner and do this for all the teams, takes about 2 mins if you alternate scouts.
Then wait a couple of in-game days and go to the reports, and check squad depth. then click the option to compare potential against own team (In my case it says something like compare potential against players at Chelsea) and quickly look for 4-5 star rated ones by using those up and down arrows previously mention. Takes a few seconds and just fully scout the ones that have high potential and make bids.
It's what I do and it's far quicker/effective then waiting for scouts to find them or checking them all individually. Just thought some people might appreciate this.