Does anyone know why....?

Does anyone know why the development players couldn't give fans their shirts after the match today? I asked a couple of players for their shirts and they said that they weren't allowed, and then Kiss and Velikonja gave fans their shirts and a steward went and got them back!
I don't understand why they couldn't give them away because they won't need them again and the 1st team players sometimes give theirs away. Does anyone know why this is?