Should I tell my girlfriend?

Say nothing. Be reactionary. If she asks why you sent them, say that they were already purchased before the break up and whether or not the two of you are still together, you wanted her to have them. Tell her that you aren't doing it to try to win her back or anything, but just a nice gesture after a long relationship that you were very happy with. Tell her that you hope the gifts show that you are still interested in being friends even though you aren't together anymore. This will let her know that you did care for her, that you want to be friends in the future and that you aren't just making a desperate plea to get her to run back to you. Good luck, man. And don't be afraid to show your feelings for someone. Some women need to be reured that you care for them more than others. Make sure your next girlfriend knows regularly how much you care for her.