@Riot about Hextech Key Fragment Drops

Okay so lately ive been able to get my hextech boxes pretty easily but im having the problem of the fact that key fragments dont seem to be dropping ive played over 100 games in the past 2 days and havnt had one key fragment drop i know they are suppose to be rare and all that but still i have a box and a pending box that needs to be opened but no rp or any key fragments so im not sure what to do right now.